Replaced the 400V Bridge Rectifier - playfield lights fired up like champs! now I only have a few more issues that I'm aware of;
There is a new electrical "buzz". As the lights closer to the backglass illuminate (especially noticeable during the sweeping attract animations, and always louder while the lights are at the top are on as opposed to the lower playfield lights. Like if the lights at the top start the attract wave, the buzzing is immediate and if the attract lights start at the bottom and go up, the buzz gets louder)
There are 4 lights out over the ramps in the "hill valley" signs, on the left sign the middle and right are out and on the right side the middle and left (so the inside 4 lights of these signs). I confirmed the bulbs work by testing in another socket, but light percussive maintenance has proven useless. there was a series of games where the middle light on the left sign began illuminating but its out now.
the bulb at the bottom of the right slingshot burned out after being replaced once already, I plan on troubleshooting after getting some new bulbs.
I have been replacing the playfield lights with the bulbs from the backglass, I need to order bulbs, and I want to go LED, are these tables prone to any problems during a incandescent -> LED changeover. Is it necessary to perform such a changeover all at once or can areas be upgraded over time?