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A 2B motor switch releases the hold on the "D" relay, check that switch out, too.
Does the machine have the same bonus lock/runaway behavior if you simply hold down the "I" rollover switch?
Another issue that could cause the behavior is a drop target, rollover or rollover button switch that is gapped too closely.
If your bonus lights are operating correctly, I don't think the extra wire on the disk of the bonus unit is an issue.
DrelayRelease (resized).pngThat's 1C, move clockwise one more switch stack (against the side of the cabinet) and down one level for the 2B switch. Match the wire colors to identify the correct switch.
https://pinwiki.com/wiki/index.php?title=EM_Repair#Gottlieb.C2.AE_Score_Motor
It looks like the upper blade of your "On Add Bonus Unit" switch is missing a contact and definitely needs to be replaced. That might cause scoring problems when you activate a lit star rollover button (100 points plus bonus), but I don't think it can cause the bonus stuck problem.
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