I own a 1982 Rickenbacker 4003 Bass, just recently when positioning the selector switch to the treble (Bridge) pickup position, Strings E,A,and D distort at all volumes, the G string sounds smooth and unaffected. I bypassed the Capacitor .0047uf between the pickup selector switch and the treble volume knob center post, thinking the capacitor might have gone bad, but still same thing..... Since my treble volume and tone knobs both check out and function,.. Is it right for me to assume its the pickup that has gone bad ??? And has anyone ever encountered a problem like this before ?