if maintenanceWindow {
		// check if any modifications are required to bring the elasticache instance up to date with the strategy map.
		modifyInput, err := buildElasticacheUpdateStrategy(ec2Svc, elasticacheConfig, foundCache, replicationGroupClusters, logger, r)
		if err != nil {
			errMsg := "failed to build elasticache modify strategy"
			return nil, croType.StatusMessage(errMsg), errorUtil.Wrap(err, errMsg)
		}
		if modifyInput == nil {
			logger.Infof("elasticache replication group %s is as expected", *foundCache.ReplicationGroupId)
		}

		// modifications are required to bring the elasticache instance up to date with the strategy map, perform updates.
		if modifyInput != nil {
			logger.Infof("%s differs from expected strategy, applying pending modifications :\n%s", *foundCache.ReplicationGroupId, modifyInput)
			if _, err := cacheSvc.ModifyReplicationGroup(modifyInput); err != nil {
				errMsg := "failed to modify elasticache cluster"
				return nil, croType.StatusMessage(errMsg), errorUtil.Wrap(err, errMsg)
			}
			logger.Infof("set pending modifications to elasticache replication group %s", *foundCache.ReplicationGroupId)
		}
		if serviceUpdates != nil && len(serviceUpdates.updates) > 0 {
			err = p.applySpecifiedSecurityUpdates(cacheSvc, foundCache, serviceUpdates)
			if err != nil {
				errMsg := "there was an error applying critical security updates"
				return nil, croType.StatusMessage(errMsg), errorUtil.Wrap(err, errMsg)
			}
		}
	}