I like Jazman's opinion. Have you tried checking the optos in switch mode?
As an aside, I didn't know you guys were members here at Pinside, cool.
Hope you get this working, because I agree, when the claw isn't working, the table isn't as fun. I had a problem where the connector to the elevator came apart and it went into everything = Lock Freeze mode. Boring!
Now I have reset and dimming issues I'm working through.