Ok next item on the list. Switches 15 23 31 and 39 (maybe the others as well) in row 7 are intermittent. Sometimes they work, sometimes not. I reseated J10 but the issue is still comes and goes. Also switch 31 (right kicker) likes to fire randomly (when the switches in the row are in the state of working). The wires and diodes are intact for these 4 switches. I did not test the diodes.
I'm guessing I should do the test where I jumper the row pins to the column pins to determine if the issue is board or playfield related?
Any suggestions?