Hey brothers, Just picked up a 78 LP Custom in really good shape and decent weight. When checking it out on the seller's amp everything sounded great. P/ups original Pat#. Opened up the control cavity and ground wiring and jack wires definitely messed with. Most of the wiring, pots, and caps looked original. Got it home and polish it up to a beautiful shine. Cleaned the strings then plug it in...funky buzz. Not too loud but worse on the neck p/up. Rolling off tone pots on either p/ups cuts it completely. Suggestions?