Jay_Diddy_B,
Thanks for the links, I'm sure they will be very helpful.
Real quick look at the schematic looks like there are a lot of jelly bean or readily available parts: DG muxes, LM311, LM339, TLE2081, AD637, OPA177, anything LT
Can anyone tell me if repair parts are generally easy to come by, are there any or many unobtainable parts: AD705JR?, AD711JR, NE5534, relays, switch, etc?