Trying to find how a playfield switch can cause a game reset. I've been through the bottom board and the playfield switches twice and can't find a short circuit or mal-adjusted switch. Switches that score 10 points have no effect, but 50 and 100 point scores cause the game to reset. Has anyone had this problem and remember what the cause was? Please help!
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If I start a game with the playfield up and trip the 50 point relay the game resets. So anything on the playfield that scores 50 points makes the game reset. Help?

When I power the game on the GAME OVER relay and the FIRST BALL relay pull in and hold. The playfield is dark, the backbox and coin slots are lit up.
When I press the Start button on the front of the cabinet the TILT, TILT HOLD, REPLAY BUTTON, START, FIRST BALL and RESET CONTROL relays all pull in and hold, the reset sequence begins and the playfield lights up. Early in the reset sequence the REPLAY BUTTON relay and the START relay release. When score reels zero and reset sequence is complete the RESET CONTROL relay releases, the TILT, TILT HOLD and FIRST BALL remain energized and the ball is kicked into the shooter lane. Playfield coils and lamps are activated normally and the ball in play indicator lights ball 1. After resetting the 10 point and 100 point switches score the correct value, however, if I close a playfield switch that scores 50 points the game resets. If I don't score 50 points on a ball, when the ball drops into the outhole the bonus counts down, the ball is kicked out into the shooter lane and the ball in play advances.

After starting a game if I rotate the score motor slightly it takes off and runs 1/3 of a revolution, during which no score accumulates and the game does not reset.

I surrender. The game now occasionally resets on scoring 500 points. When the playfield is up, it will score 50 points most of the time without reset, but won't correctly activate the A, B, or C lane relays. Playfield down and it resets on 50 point scores, unless it's the drop targets (most of the time). Have checked the loom for shorts, checked all assemblies for shorts, have pulled the playfield and bottom board three times and gone through switches, relays, steppers, and score motor with a fine toothed comb without joy. Got enough gray hair, don't need more. Ya gotta know when to hold em, know when to fold em, know when to walk away, know when to run.