So, my Warwick Corvette $$ 4 string started making a swishing noise whenever the treble pot was up (like if I was at the beach) I believe even the bass pot is the same way but is barely noticeable. It would go away if the treble pot was lowered all the way or if I switch over to passive from pulling up the volume knob. It really irritated me today so I stripped all the electronics from the bass as I couldn't see anything wrong. I will be installing everything tomorrow after I test it. Anyone knows what to look for? My only assumption is the preamp went bad. I've already used deoxit on the pots and got no change. Installed a new battery and still no change. I'm probably going to de-solder and re-solder everything this weekend.