Quoted from topkat:I haven’t made real progress. It got moved back on to do list. It is strange the when you first turn the game on it tends to work but after a few games it stops. It puts up the broken magnet code
If it wasn’t such hard to reach spot I would have just replaced the core and coil already to try..but it’s a lot of pieces to remove to get the mushroomed core out
You can remove the two ramps and upper right plastic with a little bit of maneuvering the metal bracket that holds the optos are held in by 2 nuts. Chances are it might be a broken wire to an opto more than anything else.
Its hard to imagine the coil going bad but if you had a spare you could just plug it in and see if it stops complaining.