I am having a problem with my Turner Renaissance..It's a fretted 5, High C. It is set up and plays/sounds great..but it has developed this strange problem..specifically the 8th fret of the "A" string buzzs like a mofo...My tech has hit the usual places, but can't seem to find out what is causing it. I thought it was frequency dependent, IOW it would only do that when playing an "f"..but tuning the "A" string down a whole step, so that the F is actually an Eb produces the same noise. Also hitting an F at the 13th fret of the E string makes no noise..it is only that spot. It's pretty loud too..annoying. There is also a LITTLE noise coming from the 7th fret on the same string, but I have to hit that string pretty hard to get it, and even then it's nowhere as loud. The truss rod is working.. so.. 1) there are 2 graphite rods in the channel alongside the truss rod..could one of these on the bass side be loose? or the rod itself, though my tech doubted it. 2) there are braces in the instrument ..but why would I get the rattle at only that one spot? 3) Maybe the bridge? but see #2.. There IS a solution here, but I am not seeing it. Help! TB.