First I would try disconnecting the jfet Q3. Either of the legs connected to R42.
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I don’t recall their pot details. On larger dia pots that have the mechanical terminals riveted to the resistance wafer, I have had to generally tap the rivet between a suitable center punch pin mounted in a vice and further flatten the other side of the terminal revit to restore solid mounting and restoring conductivity.Logic is an organized way of going wrong with confidence
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