It's a Top Dawg shuffle alley.
I appear to have nearly everything working. We can start, play & choose games, but it's not keeping a running score. Briefly after every frame it'll flash the score received in that frame, but then show nothing on the display. Running diagnostics, each number of the displays light as they should, except for 3 of the panels which I've confirmed as bad substituting them for the known good ones.
Something else I've noticed, in addition to flashing the frame score when a frame is complete, after the game is over it also shows the high score for a couple of seconds, then goes out, cycles through attract mode, then shows the high score again. I've reseated all ribbons & cables running back to the main board, as well as reseating the ROMs. Any ideas?