There are just a couple problems left on Black Knight and one that was bothering me was one light would not light. Replaced bulb and still had the no light. Checked wiring and diode and everything was fine. Voltage was good and jumped another socket to the one in question. The bulb lit up fine. Checked for continuity on the old one and did not have it. I took a metal brush and scoured the old socket and continuity and the light new lights up.
I also inspected the 4 flippers and came to the conclusion that they need rebuilt. I noticed that I have 3 different types of flipper coils in the machine and asked Pinside what the correct ones should be.
Spent the rest of the time ordering parts.