Hi guys, Need some advice here. I have a Fender Precision Plus bass (not sure about production date, but bought it new in 1992)... the volume knob doesn't work right. I have to set the volume button anywhere between 80% to 100% to hear the sound. Lower than that and there's no sound. Can anyone advice me what the problem might be and what part(s) need to be replaced? Thanks in adavance guys.