I agree, the IPS2000 was a bulletproof sun of a gun and if not for the damn voicemail failures 99% of em would still be in service.

I seriously doubt you have a card or PBX issue.

As stated above swapping th card is fairly simple: flip the toggle up, pull the card and put the new one in, flip it's toggle down.
Also recommend an external CSU.

Good luck!

D