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A photo might be helpful. You mentioned via PM the other bumpers have multiple white wires and the top bumper only has one.
Quoted from BRIANPG:What am I checking in the switch 38?..
Checking to see if it’s stuck closed. It’s the switch that tells the pop bumper to activate.
Quoted from Gorgar666:Same problem. Top left.
Left Jet Bumper is switch 37. Does your switch test show switch 37 is closed?
https://www.pinwiki.com/wiki/index.php/Williams_System_3_-_7#Testing_the_Switch_Matrix
Quoted from LangdonFan:Since its locking on game up and not power up can it still be a transistor issue?
Not likely. Go into switch test and see if the switch is working there before you dig into further board work.
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