If it is working do you have any hires photos of the MPU board? That would be extremely helpful. I've been able to notice two different variations of the MPU board in these. Also many have mods and I'm trying to sort out what may have been factory updates/fixes vs random hacks that people did later to make them work (or try to make them work). Also some of the information posted on these is incorrect. One shows using a 2732 ROM that could never work since one of the lines that has to be tied low is left disconnected.
There are also a couple different ROM sets floating around and not sure what versions are actually correct and do work. I read the ROM's on mine and they matched the images on flipprojects.fr
So far I have cleaned up all the battery damage, replaced the two bad RAM chips, bad RIOT chip, and a bad logic IC. Even built a reset board to clear the RAM on boot. These boards are a pain but I will make it work.
Don't particularly want to buy a working game. Just having access to some extra examples will help get this one going. Once I make this one run as a reference then I could fix any of the boards. I used to think Gameplan MPU's were time consuming until this one came along..