Hey all, my mid-'70s Ibanez Les Paul Custom lawsuit bass is everything I want in a bass *except* that it's recently started buzzing on ONE fret on the whole board and I'm about to lose it. When fretting a Bflat on the E string, the string doesn't quite clear the fifth fret and buzzes pretty badly. I tightened the truss rod and it seemed to help a little, but it's still there. These are pretty heavy strings, might going to a lighter gauge E string help? Any tips are appreciated!