I have a friend who recently picked up a very nice AD27e off of Reverb. The action is so low, many frets buzz, mostly from 5 - 9 on every string. The truss rod is completely loose to the point I can unscrew it by hand. I figure taking some tension off might allow the neck to bow a bit, but that's not an option. Will this require a neck reset? If so, any idea how much that should cost? Any advice is greatly appreciated.