Upgrading from AEM 6.1 to AEM 6.3

Hi All,

I am trying to upgrade an AEM 6.1 application to AEM 6.3 using the following instructions :-

https://docs.adobe.com/docs/en/aem/6-3/deploy/upgrade.html

After invoking "runAllPreUpgradeTasks()" , the following is reported in crx-quickstart/preUpgradeHCStatus.properties :-

areAllPreUpgradeHealthChecksOK=false

Maintenance Task com.day.cq.wcm.core.impl.VersionPurgeTask=OK

Maintenance Task WorkflowPurgeTask=OK

Maintenance Task RevisionCleanupTask=OK

Modified Deprecated Indexes=OK

Maintenance Task com.day.cq.audit.impl.AuditLogMaintenanceTask=CRITICAL

Replication Agents Disabled=HEALTH_CHECK_ERROR

Does anyone know what these errors mean and how I can diagnose / resolve them ?

Regarding the Maintenance Task :-

I checked http://localhost:4561/libs/granite/operations/content/maintenance/window.html/mnt/overlay/granite/operations/config/maintenance/_granite_weekly , and the AuditLog Maintenance Task is showing RED.

I checked http://localhost:4561/system/console/configMgr/com.day.cq.audit.impl.AuditLogMaintenanceTask , and the Configuration Binding is showing as jcrinstall:/libs/cq/platform/install/cq-audit-5.8.10.jar

Regarding the Replication Agents Disabled :-

i checked http://localhost:4561/etc/replication/agents.author.html , there are 11 agents listed total.  All are Enabled.

If you require any further information or want me to try anything please let me know.

Thanks for any advise,

Robert