I have a very similar problem with my XBR970 that recently appeared. Anytime light text is shown, or a light color on a slightly darker background, a "ghost" image proportional to the light image will show to the right. It seems to have gotten worse over the last few months.
I found the convergence setting in the service menu that the OP might be looking for. It is the CADJ setting in the service menu of the XBR970 that controls the horizontal convergence, and I would assume there is a similar setting in the FQ80. Unfortunately, my issue doesn't seem to be related to horizontal convergence.
I was just about to post a new thread about this issue, but I figured I'd try this thread first. The picture on my xbr970 is still incredible, and have not noticed any other signs of age related issues. I suspect the tube may be going bad, as I bought this TV as a floor model at circuit city back in 2007, and it had been running in full torch mode for at least 6 months.
If this is an issue anyone has heard of/experienced, I would be interested in knowing exactly what it is. The discoloration to the right of the light images is mostly noticeable in text, but can become very noticeable during certain scenes in animation. A good example is the white in the eyes of a character in Family Guy will produce a "discoloration" to the right of their eyes, making it look like the character is wearing a band between their eyes. The discoloration always shows to the RIGHT of the image, which is why I was initially convinced it was a convergence issue.
I will try to provide pictures of the issue when I get home later.