William tested continuity in the 120V circuit, tracing the path through Relay U. Here we found one of the soldered connections loose. We found that removing all 3 relay brackets, then removing their solenoids, allows best access to the leaf switch connections.

In soldering the loose connection, we knocked several others loose. The whole machine was probably poorly constructed 60 years ago.

In any case, after all that resoldering, we are in a state where the machine does not start. We ended up finding the Yellow-Black to Red-Blue connector on the bottom of Relay U, one of the ones we had resoldered, is short all the time now. We don’t think the problem is the leaf switch, but we are honestly not sure.