I'm getting some really bad fretbuzz on certain frets. I'm thinking it may be because some of the frets are higher than the others. I already raised the action as far as I want to, and it still persists buzzing. Mostly on the E string, but some on the D as well. I have a cheap Peavey Millennium, so it's to be expected, however. What do you suggest? Sanding the frets? If so, how do I find the ones that are higher than the rest?