Can you manually activate the stepper to first reset, then step it to ball 1,2,3,4,5, 6th position?

I'm thinking if it steps through all positions manually, and making proper contact on the lugs, I would carefully inspect the switch stack making note of the 6th position switch contacts.

Also without getting too involved, inspect the switch contacts at "AX".

Better yet, post a picture of the switch in position 5.