Quoted from YeOldPinPlayer:If you mean the start button, check the opto for the right flipper.
The shadow is mine. This has to be some sort of switch matrix issue. When game is powered on everything is fine. If I press the start button the right lower flipper sticks in the up position. Only the lower flipper, not the upper right flipper. I was getting an error to check switch number 11, the gun trigger. If I pull the gun trigger a few times, the lower right flipper will stick up. If I go into menu buttons on the coin door, and hit the enter button, The right lower flipper sticks up. If you shut the game off, flipper returns to resting position.