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Quoted from chad:Q14 mosfet on the Driver Board is most likely bad. This will need replacing as well as the diode 1N4007 on that specific coil.
Edit: This is the replacement Mosfet
https://www.greatplainselectronics.com/proddetail.asp?prod=IRL540N
I’m not familiar with stern, does it use a two part flipper opto board like WPC? I recently has a WPC pin do this and it ended up being a broken flipper opto interupter
Quoted from chad:OP, I would check the right cabinet flipper switch first. This is a dual switch and sometimes they can become too close and make contact , simulating a stuck up flipper....
Switch test is the place to start for the OP
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Wood River, IL