Yeah, I tried explaining this in another thread, but no one wants to hear it.

I just repaired a WPC-95 board a few hours ago and it took me 20 minutes tops to remove the board from the machine, replace two transistors that fried because the person who had this machine before me didn't know what they were doing under the playfield, then re-install the board.

Months ago I had a small PCB from a Nicktoons Racing game go bad, built by CGC. Can't repair it, can't get a replacement. Cabinet is separating just like the last one I had. Off to auction it goes.

The off the shelf minicomputer (BeagleBone Black, Rasp Pi, Arduino, whatever) acting as CPU/emulator would be $40 or less. But that, like the WPC95 CPU boards, should rarely (if ever, really) go bad.

The board in question is whatever board is acting as the power driver board. Converting power, sending 50V to the coils, etc. That board will be nowhere near $40.