The worst thing is repairing a game that some hack had his hands in in the past. Thankfully, it ended up in competent hands. Looking forward to seeing you again at York. Make sure you bring enough hay for Spanky!
As an owner of a Pro Football, I highly recommend replacing the light in the upper middle of the playfield with either a flashing bulb or a colour changing LED. Either has a very affective visual impact on this game at that upper/centre position. If you want to see what it looks like borrow a flashing bulb from behind the back glass, where there should be 3 of them, behind the words 'pro', 'foot' and 'ball' that turn on only with the 'gameover' light.
Hmm... Wondering if the game was high-tapped. Needlessly high-tapping a game accelerates wear on steppers, score units, etc., and can cause increased arcing and overheats coils. Shop a game properly, and there's no need to high-tap it if the line voltage is adequate.