Hi everyone. I've been playing for over a year and recently got my second guitar and first Les Paul, an Epiphone 1959 Standard. I took it to a tech because there was some buzzing noise when I switched to the gain channels on my Katana, which didn't happen with my other guitar. Unfortunately, I didn't record the sound, though it got louder when I put my palm near the switch cover. It also picked up some static when rubbing the back of the body against some of my shirts. I don't know any guitar techs here in my hometown in Bolivia, so I took it to one that is fairly known, but as a general instrument tech. He's had it for over a week now and apparently hasn't found the issue yet. He tells me he is still looking into it and needs a few more days. Being new to this kind of stuff I have a couple of questions. Do you have any ideas on what could be causing this issues and, in your experience, does it usually take that long to have it checked?