Athens - Nash Guild 33:
Welcome to a wonderful forum and you have lots of logical advice.
I will offer one more. I would try Carter's Vintage Guitars on 8th Avenue South (same 8th Avenue South as Gruhn's but two or three miles closer to downtown Nashville). As long as Walter Carter is there, I recommend them. I have a Guild Finesse (I bought from a LTG member). I changed strings and somehow managed to disconnect a pickup wire. I called Walter at Carter's and he told me they were 3--4 weeks behind and recommended a shop in a different part of Nashville. I called and they said, "our technician will need to to look at it." So I head on an hour drive and when I walked in, all I saw were electrics and I had an electric problem. The young fellow at the desk wrote down needed information and headed down the steps to the technician. Asked me if I had 45 minutes to an hour that the technician on first glance thought it would be a quick fix. So I sat down on a big Marshall amp (no chairs) and just gazed at electric guitars and customers. In about 45 minutes the young fellow came over and said, "your guitar is ready." Fixed it within the hour and I headed home.
I say all that to say, if Carter's has a place they recommend, they might have the same for your problem. But don't think it will be a quick fix.