Hello,
I would suggest you to perform a disaster recovery procedure for the SEPM.
Symantec Endpoint Protection 12.1: Best Practices for Disaster Recovery with the Symantec Endpoint Protection Manager
http://www.symantec.com/docs/TECH160736
Should Symantec Endpoint Protection be uninstalled from the computer before upgrading Microsoft Windows to a newer version of Windows?
http://www.symantec.com/docs/TECH197095
Hope that helps!!