I was wondering if You help with issues I have with one of my 2 sb1000’s , I’ve got one from 1980 (batwing headstock and have no problems with it although it has a replacement pickup from Kent Armstrong uk about 15 years ago, my other from 1984 has all original circuitry and although plays and sounds fine when I am not playing and say mute the strings with my left hand and turn from side to side I get a creaking sound coming out of amp . I think it must be a circuitry issue ps battery’s are fine, any advice appreciated ,even does it in passive mode , it maybe is the sound of the strap rubbing on the guitar body and the sound being picked up by the pick upThanks Tony Newcastle England