Next problem:

On a 2-player 5 ball game, the game ends after player 1 ball 5 drains.

On inspection, the last ball(XB) relay fires after player 1 ball 5 drains followed shortly by the game over relay.

By inspection, the 2nd player relay, add player unit relay, and relevant player unit switches seem to be appropriately open/closed.

Where should I look?

Thanks

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Ok, I have been studying all the switches in that part of the schematic and I believe that I have found a problem with P2A. It appears to be wired wrong. The upper lug has no wire attached to it (see photos). I included a hand written diagram of how the switches are wired.

I think the Wh-Gr wire should be moved to the upper lug. Is that correct?

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83A0D1E0-8FDB-4422-8B64-9980E8DD8B3D (resized).jpeg

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Moving the Wh-Gr wire did the trick! Other than an occasional intermittent misfire, I think it is running 100%.

Thanks for your help, MarkG!