Ive got a Partscaster - its a homemade job which turned out really well despite my technical limitations and I have used it for many gigs and recordings for the last 10 years or so. Its 4 way wiring with Fred Stewart Blackguards but I also had a treble bleed circuit in it. It was so long ago I cant even remember the specs on it - but it was from a respectable source. After hanging on the wall for some months without getting played (the guitar, not me!) the Tele went from being a 4 way, to a 2 way with a particularly horrible plasticky tone from what is normally a great sounding FS neck pickup.The pickup selector ceased to function correctly. With the circuit out on the table I noticed some noisy signal interruption from the volume pot when poking around the various solder joints. I removed the treble bleed (a resistor and cap) which seemed to be the culprit and suddenly the switch was back to normal - guitar sounded a lot better. I am curious as to how these components 'normally' deteriorate - gradually or do they just die?. I checked all the solder joints and they were ok - reflowed them all as well - but it wasnt until I took the TB out that it seemed to make any difference, Personally the TB circuit started off as a trial thing and I left it in but really I mostly use the Neck pickup at low -medium levels so I dont mind the guitar sounding a bit darker - it actually sounds better to my ear now! Be great to get some insight into the causes of these symptoms if anyone has something to offer. Ta!