TGP'ers, I just acquired a used JP6 with stainless frets. During my initial cleaning and setup last night, I confirmed with a fret rocker that the 6th fret is high, but only on the treble side of the neck. The notes on the 5th fret on the high E and B strings choke out badly. Can this be resolved with just a little bit of filing/sanding on that area only, or does the whole neck require a complete fret leveling? I've adjusted the saddles and it helped, but I don't want to raise the action any further. Thanks.