I had my Taylor set up when I bought it and it was done really nicely. I had no problems fretting it and the action was low enough. After about 3 years, I started seeing my string getting higher and higher off the frets. The fret board began to have a slump in the middle, so I used the trusts adjustment to take it out, leaving just a little in it, and lower the strings back. That worked, but now when I fret the bass strings (the wrapped strings), especially at the 12th fret area, I hear a metallic like "ching" sound. It can be heard on the 4-6th strings when letting off or fretting therm. There is no string buzz after they are fretted, and I only hear that strange metallic like "ching" sound when letting off or fretting the strings. Going up the neck, after about the 8th fret, it goes away. Any ideas? It's so much easier to play like it is right now, but that upper fret metallic like ching sound is really annoying when letting off of fretting the string.