Welcome to Pinside sed6! I'm not an expert on early SS Bally, but I would like to ask if you have joined our local group? If not, please do, we would love to have you!

http://www.meetup.com/Oklahoma-City-area-Pinball-enthusiasts/

I'll take a stab anyway. Do the cooresponding switches register properly in switch test?

I would look at every switch in that column closely and make sure one isn't shorted to ground or a GI socket, etc.

Again, I'm no early SS or driver board expert but shouldn't the solenoid drives be separate? It sounds like you have some that are shorted together. Can anyone chime in on this?