I've got an old USA Peavey Predator that I'm going to be refinishing soon andwas wondering if y'all could help me figure out where the problem is in it's electronics.
The pickups work fine as long as the tone knobs are on at least 3 or so but when they are completely rolled off, there is almost no sound from the high E string. This effect is also noticeable on the B string but to a lesser extent.

My question is whether or not it is the pickups themselves that are faulty or if it is in the tone pots/wiring or something. I know basically nothing about guitar electronics (or electronics in general ) so any help would be greatly appreciated.

Thanks in advance,