Hi to all Beemers,I'm newbie here and i had a e39 523i year 2000.I facing a problem that my radio when turning the volume knob suddenly it will go to explode volume, normally now i'm using steering malfunction to adjust the audio volume only. And the sound only coming out from driver seat speaker only, others don't have sound. Suspect the audio player defect.Kindly ask is there any specialize to send for repair this audio player? Cause if wanna change to the taiwan touch screen audio player quite expensive.Regards,yap