Actually, that does not sound good. You can try the steps here.
but I'm afraid this issue may have exceeded the tombstone lifetime and rebuilding it from scratch may be the better option. This isn't that difficult. After removing it from the network you can perform cleanup. I believe HYPNOS is already the role holder but you can check by running netdom /query fsmo (on HYPNOS) Then do cleanup to remove the remnants of failed one.
After doing so it is important that after a reboot HYPNOS is 100% error free in system and FRS Replication event logs. Then you can begin the rebuild process of HERACLES.
I'd use dcdiag / repadmin tools to verify health
correcting all errors found before starting
any operations. Then stand up the new 2008, patch it fully, license it, join existing domain, add active directory domain services, promote it also making it a GC (recommended), use dcdiag / repadmin tools to again verify health, check again both are error free in system and FRS Replication event logs.
--please don't forget to
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