So I bought this bass on craigslist for 75 bucks because what the heck. It's an early 90's ibanez sr885. So I have a problem. I tried out the bass and there was this awful buzz, and a continuous low rumbling/popping sound...kind of like what you might hear if you blew into a microphone. I figured there was something up with the pots...so I took it in for repair. They replaced some caps and fixed some faulty wiring in the input jack, which got rid of the buzz, but the rumbling/popping persists. What I'm wondering is if the issue is not in the pots/caps but in the pickups themselves? Could old/damaged pickups be the source of the problem? If so, would they just need to be rewound, or fully replaced?