Question : DCOM got error "Logon failure" error on DC

I'm getting the following every hour, on the dot, on a Global Catalog DC (holding FSMO roles). It relates to an account servacc that was set up by some support engineers a while back. How can I find out what password DCOM is trying to log the server on as, and either change the account it is using, or match up the passwords?

Event Type:      Error
Event Source:      DCOM
Event Category:      None
Event ID:      10004
Date:            4/1/2008
Time:            9:42:56 AM
User:            N/A
Computer:      2KSVR
Description:
DCOM got error "Logon failure: unknown user name or bad password. " and was unable to logon DOMAIN\servacc in order to run the server:
{3E2E4965-2518-40A4-A72B-95FCE2809D03}

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Answer : DCOM got error "Logon failure" error on DC

Ended up moving the Sophos enterprise management software to a new server as part of a migration - this has resolved the problem. I learned a lot though, so some points on the way shortly!