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No such thing as simply sanding down the higher fret a little?
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Yes, but you should first eliminate a lifted fret as the cause of the problem. If the fret is loose, it can deaden the note played on that fret. I tap on the fret with the edge of a 6" stainless steel ruler. If it sounds a dull 'clank' instead of a sharp 'ping', it is loose. Compare the sound of several frets, and the loose one will be more obvious.
I prefer to do the fret leveling and crowning with files, then final smoothing with progressively finer sandpaper.