yeah, i'll have a look this weekend inside if i get motivated. i'm pretty interested but there are so many screws!It's totally possible that it has simply been ordered that way. The old catalogs show only the same color versions (red/red, white/white, black/black), but I've seen more than one instrument with a different combination.
XPs have only been made between 1985 and 1987. You might find a date code on the pots, if these are still original.
i'm sure it's all original on the inside assembly wise.
i happen to be in a project where it works, but my guitarist hates it.
i have no real plans to sell it, nor am im offering it up here but if i did i'd want to know more or less for sure but i suppose it will be unanswered.
i do wish i had the third knob! not sure where i lost it, but i think they are original i believe