FYI if anyone is considering this--be sure to ask about what the seller means about the circuit board. There are no drop-in circuit board replacements for this game available from anywhere. It's too old and too obscure.
There are 5 boards in this game--the MPU, the power supply, the regulator, and two score displays.
The regulator is the only thing you could potentially replace with something else without too much effort. But technically, that's not a PCB--just a TO-style regulator in a socket and mounted in a heatsink.
If the regulator isn't working, then the game wouldn't be functioning at all.
If this game is missing any other circuit boards, I would recommend avoiding it unless you intend to make your own boards, or intend to convert the game to utilize an arduino or something. You will likely never find original PCBs.
Pinwiki page on this game: https://www.pinwiki.com/wiki/index.php/Viza_Manufacturing
Uh, no. There's been at least 4 (including mine) on pinside alone.
I've also seen a few more pop up on facebook in the past few years.