Quoted from pinballplusMN:Would replace diode on coil as well. Possibly open?
This....a bad coil diode will do this all day every day!
Another thing to check: Since it's not following the board it's definitely on the playfield or the wiring. On my LOTR the main under playfield harness runs REAL close to the left of the metal cabinet playfield rails. Ive had that under playfield harness snag on that left metal rail and short out a couple of wires.