Hi njPinWiz,
I worked on one of these a few months back, plus PinHead52 is a real guru on these types of machines.
The interlocks were a pain for me too. I had to clean all of them, lightly sanding any residue on the coil and/or the plate. Then lots of testing to see if the hold and release correctly.
I can try and help where I can…fire away
Danny