Quoted from DumbAss:Neither am I.
I will leave the following for those reading this thread (and are interested) with things to think about.
There are some design flaws or omissions on the OEM boards. Sometimes, they are serious. While it is true that almost all games have survived despite these flaws, there are some that have taken damage over the years.
There are also outdated and inefficient designs used on the OEM boards. Linear regulator circuits are inefficient and dissipate a lot of heat. Switching regulator circuits are much more efficient and can drastically reduce the amount of heat dissipation.
That being said, the one big advantage to using an OEM board is the familiarity of the circuits and design. Not all 3rd party (replacement) boards are re-designed (such as using MOSFETs instead of BJTs).
DumbAss you are a true hero to the Bally / Williams world, among others (system 11, etc). If I needed a replacement board, yours is 100% where I'd go.