WOZ castle door tip:
If the right door stops opening properly and it's not loose on the shaft or making a whining noise:
Try cleaning the pins on all the castle playfield connectors with rubbing alcohol and a q-tip.
Especially #11 or the big 9 pin motor wire connectors.
I just replaced my 2 motors that were burnt out.
They were perfect for a couple days then the right one developed problems. Since they were new, I decided it was low power due to connector failure.
A fair amount of black oxidation or pinball dust came off onto the q-tip. Possibly from the castle flipper mech. (I rebuilt the mech when I had the playfield out. It was pretty worn at 750,000 flips).
Cleaned all the pins and it's perfect again.