Vintage Synth Repair

OK, time for me to try to get some of these old guys working 
again... Below is a list of what I've got thats broken. If anyone has 
any experience or repair tips they can offer for any of these I 
would greatly appreciate it.

Arp Omni - No audio from synth section

Arp Odyssey mk3 - VCO2 out

Roland Promars - VCO2 out, odd front panel behavior

Prophet-5 Rev. 1 - Gee, a NW Rev. 1?? :-) Various LEDs flicker 
and fade out on power up, no audio or controls working. Tested 
voltages at power supply and voltages were off quite a bit and 0V 
on -5 and -15 so replaced w/new regulators and tantalum caps 
and -5 now OK but -15V outputting -20V, WTF? Also unreg 
measures about 28V instead of 22V.

Rhodes Chroma - All EPROMs were corroded - replaced w/new 
ones but still powers up in weird state, no audio or controls 
working

Roland SH-101 - Sequencer/LFO does not function

Roland SH-101 - Won't power up from batts or AC

Chroma Polaris - 1 voice out

Oberheim SEM - no power

Oberheim SEM - VCO2 constant high freq sound

Sequential MultiTrak - Sound is totally muffled as if VCF is stuck 
w/low cutoff freq

Moog Prodigy - no power

Moog Opus-3 - Always has slow attack regardless of EG setting

Whew! Got my work cut out for me for sure. I am most interested 
in getting the Chroma and P-5 working first. Thanks for any help 
or suggestions!

Doug