Calm down guys, I've been a videogame collector for 18+ years
I would never plug in an untested game (and would not advise anyone else to do so either) without disconnecting the boards and testing the psu voltages.
I have an almost identical machine (different game), when I powered it up (with the boards disconnected) it was putting out 12v on the 5v line as the ancient regulator had shorted. That would have been fairly damaging to everything had I just plugged it in.
£180 is a premium LED set for a pinball machine