Just to jump in here, but have you done an overall assessment of the condition of the relay contacts and wires yet? If the wire bundles are not disturbed or look like they are original, the thing to do is to visually examine, adjust and clean the contacts throughout the machine. I work on a lot of EMs and following this method has fixed most of the problems I have run into. If I have a problem with a scoring issue or reset, I reference the schematic but that doesn't happen very often as the problem is usually a relay that needs adjustment, a wire that is frayed, a sticky stepper unit etc. You should not have to wire up a doorbell switch.