I have a Peavey TKO115 from the 80's. It works fine for the most part, but has a couple of issues. Without going into detail, I think they are relatively minor problems. The problems are intermittent and are probably caused by dirt and dust. I've asked people about it before and been told that a tech just needs to open it up and clean it, check connections and it should be fine. Is this something that can be done by anybody who works on amps, or do I need to find an official Peavey repair tech?