I would also be sure to examine the playfield power board closely - take it out of the backbox, examine all solder joints, and replace/reflow solder. Because I'm more of a 'shotgun repair' guy, I would also replace the transistors responsible for those coils (esp the locked on one) and measure the resistors in that circuit to be sure they're doing what they are supposed to. Had a messy one myself with a LW3.
Also be double darned sure to test that bridge rectifier in the power supply board. Should be some good tutorials on YT.