So far, this is what I've found:
Hard drive interrupter mechanism shot. Sending to Seagate for possible repair/recovery. (not optimistic about the outcome) Installed CF drive.
All internal ribbon cables either completely shot or very close to it. Replaced all.
Power supply not functioning correctly. Replaced with a 'spare'.
Something burnt out on CPU card (not sure what yet), replaced card with 'spare' for now.
Something burnt out on 3rd card from bottom of cage (not sure what yet), replaced card with 'spare' for now.
Bunch of memory IC's blown. Replaced memory as needed.
5 bad voices. Were already disabled.
Back light out. Not going to bother with that one.
Other than that, it seems to work fine!