Quoted from Arcade:Turns out it was a 10 amp fuse that you can barely see in my last photo above.
The fuse holder is screwed to the bottom of the head just under the power board.
Not sure if this is stock or something that was done to this game.
That sounds like stock to me. Firepower has a fuse card just below the power driver board. I think they continued with this fuse card in Sys 7 but the number of fuses varied over time.