You've gotta laugh haven't you.
I've followed this thread for a fair while with a mixture of amusement and empathy for the struggles Rob has gone through. He's not far from my work so I offered to drop in and see if an extra pair of eyes could notice anything. I'm an extremely long way from an expert, but have a couple of EMs that I have got or kept going. A Wild Life of similar vintage to Profootball that has never really played up, just a few relay gap issues, and my Stern Disco from '76 which was not working on arrival and I have sorted out a fair number of problems and now runs well.
Seeing that the last report was Profootball was running and then something went wrong, I naively thought it's got to be something simply - maybe it still is? At lunch yesterday I browsed the thread again and thought gee a lot of people who know what they are talking about have offered advise here - am I about to make a dill of myself?
Anyway it was good to met Rob and we had some fun, but the the thought we would be playing Profootball and swilling beers within the hour soon vanished, some more hours on despair and depression were beginning to set in. There seem to be a myriad of problems and we lept from one to another with little real progress, but probably more understanding for both of us.
Rob, about the bumpers, I was talking crap last night. Those bottom switches are EOS for the bumpers and act to cancel the B relay - the one hanging under the playfield. They should be set to be normally closed and to open when the bumper reaches fully down. So they are installed correctly, but adjusted badly. This is as indicated on about row 2 of the schematic. Relay B drives BOTH bumper simultaneously - you were absolutely right. I've got a scan of a page from a book by Hank de Jager which talks a bit about this - I'll email it to you from work on monday. The B relay is also responsible for adding the score obtained from the bumpers. (I think the idea of the bumper bottom switch being a scoring switch comes from SS machines) Sorry about the goose chase on this one.
Another thought occurs based on the info you sent through; The instruction cards say the game resets to a start position upon a touch down being scored. Maybe run your eyes over PF switches that could indicate this. But again maybe this is not the area because the ball launch solenoid never fires.
I'll do some more looking at the schematic and try to come up with a more systematic approach for next time. I still predict you'll get there and love the game.
