I have a WMS Indiana Jones that plays fine until I get 2 balls locked in the idol. After the second ball is kicked up to the idol, the game puts 2 balls in the shooter lane.

Where do I begin to try and trouble shoot this?

OK, started looking at the pin. Put it in test mode, pulled the connector off of the trough opto board closest to the front of the machine and discovered a break in one of the wires. Looks like I need to replace that first. Also, now none of my opto switches work anywhere on the game. Would a bad connector at the trough cause all of the optos to go bad, even the ones on the ramps for instance?

Tested the optos with a camera and they were all fine. Put the pin in test mode for switch edges and it appeared fine. As a test, while I was pushing the flipper buttons I could get the trough 3 switch to flicker. I think I've found the problem.

An update for anyone in the future that might encounter the same issue, I tried re-flowing the relevant optos on the ball trough transmitter board. Still didn't work. Got tired of screwing around with it. Went ahead a purchased a new transmitter board from GLM. Problem solved.