If it is at all possible, can you find out exactly how he dressed down the fret edges without filing through the poly finish (if that's what he did)? I asked a well know guitar tech in this area about fixing fret sprout and he said he'd use a file but he'd have to touch up the poly finish at the edge of the fretboard with more poly because the filing would go through it. I didn't want him to do that and consequentially still have the fret sprout. I want o find a solution that leaves the finish intact. BTW, I'm in the North East.