I am working on a spare Rottendog MPU327-3 combo board that I recently got with a group of boards. Unfortunately IC17 was missing. I can't find any reference photos of schematics for this specific version of the board. It is a 14-pin IC that I think may be a 7406. If you happen to have a game with this revision board could you take a look to confirm the chip number in IC17? The schematics for the MPU327-4 are different. Also the earlier MPU327-1 used an odd 74HCT9114 chip at IC17 which is a different board too. Not too much that I can find on this -3 revision. Would like to finish repairing it as a backup or as a loaner when I do repairs for others.
The only picture I found of the board online was for an old ad:
https://pinside.com/pinball/market/classifieds/archive/66879