pctravel

My OEM Sat tuner is on the blink. I bought the car used and it looks like the tuner got some moisture in it (looks like some rust dust on a part on the board). When I select "sat" on the command it says "not available". Are there some hidden fuses somewhere for the tuner? and is there anywhere that repairs the actual unit or am I stuck buying a new one? I would guess a couple components on the board need to be replaced.