I have a mid 90's Fender P Bass Special. Also known as the "cowpoke". This is a Mexican P/J bass. There is a electronic buzz when I plug it into the amp, or into a PA system. The buzz is worse on the J pickup, and much worse with the treble turned up. I've turned down the treble knob, and tried playing exclusively on the P pickup. That makes the buzz better, but it's still there. I had a reputable guitar tech in Atlanta (former Steve Howe) go through the electronic looking for loose or cold solder joint, and clean all contacts. Even after that, the buzz remains. I'm hesitant to rip things out. I'm looking for advice on what to replace, and what brands you would recommend.