i have a mates jazz bitsa bass i am borrowing for awhile, its has emg jazz pickups , its has a slight issue with the neck pickup , i cant volume from the E and A strings , the D and G are fine . i changed battery , adjusted pickup heights , used switch cleaner ,new strings , check the wiring for loose connection or dry solder , but everything seems fine . i am think its a problem with the volume pot ???? and help would be great