Quoted from Quench:Have you done ^^^ yet? You're attempting a lot of blind repairs without taking voltage measurements.
When the feature lights are out, what DC voltage are you measuring at:
Test point TP1 on the Rectifier Board?
The common power braid wire that runs to every feature lamp under the playfield?
Test point TP1 on the Lamp Driver Board?
Test point TP2 on the Lamp Driver Board?
I have to agree I would use some jumpers with Alligator clips to the test points and a Volt meter and see what’s going on as they are working and as the stop working.