diff --git a/src/com/mirantis/mcp/UpgradeChecks.groovy b/src/com/mirantis/mcp/UpgradeChecks.groovy
new file mode 100644
index 0000000..60ab9a6
--- /dev/null
+++ b/src/com/mirantis/mcp/UpgradeChecks.groovy
@@ -0,0 +1,154 @@
+package com.mirantis.mcp
+
+/**
+ * Run check with parameters
+ *
+ * @param salt                com.mirantis.mk.Salt object
+ * @param venvPepper          venvPepper
+ * @param cluster_name        MCP cluster name
+ * @param raise_exc           Raise exception or return status of check
+**/
+
+def check_34406(salt, venvPepper, String cluster_name, Boolean raise_exc) {
+    def sphinxpasswordPillar = salt.getPillar(venvPepper, 'I@salt:master', '_param:sphinx_proxy_password_generated').get("return")[0].values()[0]
+    def waStatus = [prodId: "PROD-34406", isFixed: "", waInfo: ""]
+    if (sphinxpasswordPillar == '' || sphinxpasswordPillar == 'null' || sphinxpasswordPillar == null) {
+        waStatus.isFixed = "Work-around should be applied manually"
+        waStatus.waInfo = "See https://docs.mirantis.com/mcp/q4-18/mcp-release-notes/mu/mu-9/mu-9-addressed/mu-9-dtrain/mu-9-dt-manual.html#i-34406 for more info"
+        if (raise_exc) {
+            error('Sphinx password is not defined.\n' +
+            waStatus.waInfo)
+        }
+        return waStatus
+    }
+    waStatus.isFixed = "Work-around for PROD-34406 already applied, nothing todo"
+    return waStatus
+}
+
+def check_34645(salt, venvPepper, String cluster_name, Boolean raise_exc) {
+    def updatecellsPillar = salt.getPillar(venvPepper, 'I@nova:controller', 'nova:controller:update_cells').get("return")[0].values()[0]
+    def waStatus = [prodId: "PROD-34645", isFixed: "", waInfo: ""]
+    if (updatecellsPillar.toString().toLowerCase() == 'false') {
+        waStatus.isFixed = "Work-around should be applied manually"
+        waStatus.waInfo = "See https://docs.mirantis.com/mcp/q4-18/mcp-operations-guide/openstack-operations/disable-nova-cell-mapping.html for more info"
+        if (raise_exc) {
+            error('Update cells disabled.\n' +
+            waStatus.waInfo)
+        }
+        return waStatus
+    }
+    waStatus.isFixed = "Work-around for PROD-34645 already applied, nothing todo"
+    return waStatus
+}
+
+def check_35705(salt, venvPepper, String cluster_name, Boolean raise_exc) {
+    def galeracheckpasswordPillar = salt.getPillar(venvPepper, 'I@salt:master', '_param:galera_clustercheck_password').get("return")[0].values()[0]
+    def waStatus = [prodId: "PROD-35705", isFixed: "", waInfo: ""]
+    if (galeracheckpasswordPillar == '' || galeracheckpasswordPillar == 'null' || galeracheckpasswordPillar == null) {
+        waStatus.isFixed = "Work-around should be applied manually"
+        waStatus.waInfo = "See https://docs.mirantis.com/mcp/q4-18/mcp-release-notes/mu/mu-12/mu-12-addressed/mu-12-dtrain/mu-12-dt-manual.html#improper-operation-of-galera-ha for more info"
+        if (raise_exc) {
+            error('Galera clustercheck password is not defined.\n' +
+            waStatus.waInfo)
+        }
+        return waStatus
+    }
+    waStatus.isFixed = "Work-around for PROD-35705 already applied, nothing todo"
+    return waStatus
+}
+
+def check_35884(salt, venvPepper, String cluster_name, Boolean raise_exc) {
+    def waStatus = [prodId: "PROD-35884", isFixed: "", waInfo: ""]
+    if (salt.getMinions(venvPepper, 'I@prometheus:alerta or I@prometheus:alertmanager')) {
+        def alertaApiKeyGenPillar = salt.getPillar(venvPepper, 'I@salt:master', '_param:alerta_admin_api_key_generated').get("return")[0].values()[0]
+        def alertaApiKeyPillar = salt.getPillar(venvPepper, 'I@prometheus:alerta or I@prometheus:alertmanager', '_param:alerta_admin_key').get("return")[0].values()[0]
+        if (alertaApiKeyGenPillar == '' || alertaApiKeyGenPillar == 'null' || alertaApiKeyGenPillar == null || alertaApiKeyPillar == '' || alertaApiKeyPillar == 'null' || alertaApiKeyPillar == null) {
+            waStatus.isFixed = "Work-around should be applied manually"
+            waStatus.waInfo = "See https://docs.mirantis.com/mcp/q4-18/mcp-release-notes/mu/mu-12/mu-12-addressed/mu-12-dtrain/mu-12-dt-manual.html#i-35884 for more info"
+            if (raise_exc) {
+                error('Alerta admin API key not defined.\n' +
+                waStatus.waInfo)
+            }
+            return waStatus
+        }
+    }
+    waStatus.isFixed = "Work-around for PROD-35884 already applied, nothing todo"
+    return waStatus
+}
+
+def check_36461(salt, venvPepper, String cluster_name, Boolean raise_exc){
+    def common = new com.mirantis.mk.Common()
+    def waStatus = [prodId: "PROD-36461", isFixed: "", waInfo: ""]
+    if (!salt.testTarget(venvPepper, 'I@ceph:radosgw')) {
+        return
+    }
+    def clusterModelPath = "/srv/salt/reclass/classes/cluster/${cluster_name}"
+    def checkFile = "${clusterModelPath}/ceph/rgw.yml"
+    def saltTarget = "I@salt:master"
+    try {
+        salt.cmdRun(venvPepper, saltTarget, "test -f ${checkFile}")
+    }
+    catch (Exception e) {
+        waStatus.isFixed = "Check skipped"
+        waStatus.waInfo = "Unable to check ordering of RadosGW imports, file ${checkFile} not found, skipping"
+        if (raise_exc) {
+            common.warningMsg(waStatus.waInfo)
+            return
+        }
+        return waStatus
+    }
+    def fileContent = salt.cmdRun(venvPepper, saltTarget, "cat ${checkFile}").get('return')[0].values()[0].replaceAll('Salt command execution success', '').trim()
+    def yamlData = readYaml text: fileContent
+    def infraClassImport = "cluster.${cluster_name}.infra"
+    def cephClassImport = "cluster.${cluster_name}.ceph"
+    def cephCommonClassImport = "cluster.${cluster_name}.ceph.common"
+    def infraClassFound = false
+    def importErrorDetected = false
+    def importErrorMessage = """Ceph classes in '${checkFile}' are used in wrong order! Please reorder it:
+'${infraClassImport}' should be placed before '${cephClassImport}' and '${cephCommonClassImport}'.
+For additional information please see https://docs.mirantis.com/mcp/q4-18/mcp-release-notes/mu/mu-15/mu-15-addressed/mu-15-dtrain/mu-15-dtrain-manual.html"""
+    for (yamlClass in yamlData.classes) {
+        switch(yamlClass){
+          case infraClassImport:
+            infraClassFound = true;
+            break;
+          case cephClassImport:
+            if (!infraClassFound) {
+              importErrorDetected = true
+            };
+            break;
+          case cephCommonClassImport:
+            if (!infraClassFound) {
+              importErrorDetected = true
+            };
+            break;
+        }
+    }
+    if (importErrorDetected) {
+        waStatus.isFixed = "Work-around should be applied manually"
+        waStatus.waInfo = importErrorMessage
+        if (raise_exc) {
+            common.errorMsg(importErrorMessage)
+            error(importErrorMessage)
+        }
+        return waStatus
+    }
+    waStatus.isFixed = "Work-around for PROD-36461 already applied, nothing todo"
+    return waStatus
+}
+
+def check_36461_2 (salt, venvPepper, String cluster_name, Boolean raise_exc) {
+    def cephMonPillar = salt.getPillar(venvPepper, 'I@ceph:mon', 'ceph:common:config:mon:auth_allow_insecure_global_id_reclaim').get("return")[0].values()[0]
+    def waStatus = [prodId: "PROD-36461_2", isFixed: "", waInfo: ""]
+    if (cephMonPillar.toString().toLowerCase() != 'false') {
+        waStatus.isFixed = "Work-around should be applied manually"
+        waStatus.waInfo = "See https://docs.mirantis.com/mcp/q4-18/mcp-release-notes/single/index.html#i-cve-2021-20288 for more info"
+        if (raise_exc) {
+            error('Needed option is not set.\n' +
+            waStatus.waInfo)
+        }
+        return waStatus
+    }
+    waStatus.isFixed = "Work-around for PROD-36461_2 already applied, nothing todo"
+    return waStatus
+}