My new-to-me '73 Guild JS-2 has just developed some kind of annoying popping sound when I touch the pickup switch, the bass-cut mini-toggle or the chrome pickup cover... It doesn't happen every single time, but it happens enough to annoy me. Keep in mind I have very little electronics knowledge, but it sounds like a grounding issue, right? So what should I look for to determine if that is what the problem is, and how do I fix it? I've proven that I'm pretty terrible with a soldering iron, so is this something I should have my tech take care of? Thanks guys!