great to hear about the dmd,
when I did my shop out of baywatch I took photos of everything but didn't take notice of particular alignment. The photo attached shows the removal of the ball advance which lets one ball at a time into the vuk that shots the ball up for the plunger. It has a tiny bit of play which I didn't take notice of and if not placed in the exact location means it will hold all the balls off their ball trough switches. Try adjusting with the switch diagnoses up on the dmd as then you can see when all the switches are on or off. You might not have taken it off but maybe the previous guy did something here.
Hope it helps