Crumar Musical Instruments User Group.

I recently picked up a T1/C for a song, only 25 bucks. I'm having a ton of fun with the bass section, but there is no sound on the treble section. Everything on the upper section of the keyboard will not produce a sound. I've repaired a ton of synths in the past, but none of them are as complicated and messy internally than this one. I would greatly appreciate it if someone with some knowledge of these machines could help me pinpoint a problem area, I've checked a ton of diodes and was planning on replacing the opamps but am not sure whether I should shell out the cash for them without some proper guidance.

If I press a few keys in the treble section, I hear a faint crackle, but only briefly. I would love to get this working, any help you can offer would be greatly appreciated!

Thanks!