> as it left the factory = no repairs?
Assuming the repair used OEM, or functionally identical aftermarket parts, repairs are fine. Replacing an OEM 4 way joystick with an aftermarket 8 way joystick (not functionally equivalent) like old mate Billy did, is not as it allows movements not intended by the game designers, thus making the game play different to the stock commercial cabinet. If they had a category specifically for DK with 8 way joysticks, he would be golden.
> The rules allow repairs.
Of course they do.
> As for coin slots being changed to differnt coins / tokens?
> card system?
> DBA?
> CC reader?
> free play button?
Do any of these have an impact on the function of the the game ROMs? How the sprites move on screen? The timings of the mainboard logic or how the play field is rendered? No. No they don't.
> What about official from the factory rom updates? That in some cases are installed in later runs of an game?
> factory official conversion kits?
There would be categories for each revision. The rules are available online, rev up that search engine my dude.