NetBackup unexpectedly going offline - VCS

Hello,

I have looked on many forums but can not find nothing helpfull.

I have NetBackup 7.6.0.2 on VCS with GCO on RedHat 6.

Since last upgrade I have issue with restarting the NBU by VCS. It looks like one of monitored NBU processes is not responding.

I can not find what kind of process exactly is not responding.

AGENT_DEBUG.log shows nothing and also VCS engine_A.log and NetBackup_A.log are without detailed information.

I have enabled debug logging on VCS but without expected result.

Can someone help me how to find that particular process?

Many thanks in advance
Madej