I am trying to fix a IGT IA70C Multi-Poker machine. Quarters drop right through to the winners bin. I don't see 24vac on the yellow and black wires. The small credit switch doesn't seem to work, The machine has about 300 credits on it. Is there something telling the comparitor to not run? I can trigger two of the three coin sensors (I think its A I don't see). I can also get the gate to move with the test menu. Also, some of the hold/cancel buttons don't work using the test menu. Is there wiring diagrams or service manuals for these machines?