Hi EM experts. Need some help tracking down a problem. Game came to me not working at all, finally have almost everything working, having issues with player 3 resetting and player four advancing to player 1. Don't know if they are related but, I'll do my best to describe them and what I know.
1. Player 3 reset.
If the score reels have a score then, when game start is pressed, reels for player 1 and 2 reset correctly. Player 3 turns one time and then stops, game starts normally, player unit increments to player 1/ball 1 and game operates normally, even though player 3 still has a score on it. If you keep resetting, it will eventually reach zeros.
I have continuity between player 3 tens reel (BR-wh-red) and player 4 10,000's (OR-WH-RED) when they are all zeros and open when any of the reels for 3/4 are not.
Z2 works but. Only momentarily (replaced with known good same issue)
If I disconnect wire between add player unit and Z2 it holds and turns reels to zero but won't increment player unit and sticks there(21) see pic
Switches on Z2 are adjusted properly.
Thoughts?

2. Player 4 scoring
Player 4 lights as it should and ball is put in the shooter lane. Whenever the first score happens the player unit jumps to player 1 and scores there. From then on, anytime the "P" relay engages in the ball release, player 4 scores 100 points regardless of the player it's on. This repeats on all 5 balls.
I isolated this to the wire. (BR-WH-RED) between the add player unit and the 4th player 10s. If I remove that wire from the player unit, it scores correctly.
Thoughts?

Things of note: AX operates correctly. Resistors are connected and correct values.

Any help, insight, troubleshooting steps, or theories would be welcome. #300

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