i have the FMS Audio model number; 14787462 (CD, not mp3) in my 04 8 and ive been having problems with static from the speakers...all 4 just randomly putting out a bit of static behind the music.

i pulled the deck, took it apart and saw that D509 (diode?...SA4CA) is bubbled and burnt, it has polarity and leads to +B pin of the bigger connector on the back.
i cant seem to find any information on this component, Google dosent turn up anything reliant.