In the middle of a game, the left eject hold stopped working. The switch works, the game knows a ball is there as it awards the mystery, but the ball doesn't eject.

What else can I check?

We checked and tested the wiring, can fire the coil by grounding the transistor, swapped in a new coil, factory reset. Does not fire in coil test mode. Switch works in test mode.

Driver board swapped into my friend's No Fear and it works 100% on his game, eject works.

Will be able to swap in another CPU board next week to test.

Fixed. Went back over the ribbon cables to replace the CPU-Driver board cable with a new one I have. Found a pin bent outward on the CPU connector. Straightened it and used the original ribbon cable, working again.