Efner, I know they repair almost anything. However this is the quote taken from the site about earlier model CD players that I was referring to. I'm sure they would do whatever they could.
From ARC Website:
Owners of CDT1 transports and CD1 and CD2 compact disc players should call Audio Research Technical Service (763-577-9700) before sending any of these models to Audio Research for repair. Certain repair parts are no longer available for these models. To avoid the expense of needlessly shipping a non-repairable unit, please be certain to call Technical Service beforehand.