In a nutshell the truss rod doesn't work from about the 12th/14th fret up to the pocket. The rest of it works perfectly, but it's a pain having half a dozen that are too high. I'm looking at some minor but lasting surgery on those high frets, which I would rather not. Or popping the skunk stripe out and trying to locate and replace a 40-year old truss rod without needing a new fretboard or refret. Or whatever anyone else can recommend!