Has anyone tried to polish their handles rather than send them out for chrome/paint/powder coating? I have polished up ball guides, ramps, and hardware before but was wondering if it was worth it to try the handles. On mine, the coating has worn through past the copper? plating so it might be too far gone.

Can't the diagonal lines be the slam tilt/memory protect as well? Does it make an electrical sounding "bzzzzt, bzzzt" sound when it resets? Seems too simple for your problem description, but it is easy to check those switches and rule it out.

One of the other things you could do is open the coin door so the coils are disabled and check if it is the switch causing the issue, or if it is the coil.