I have a KDL46V2500 ( which I think is very similar to the XBR) that may have a similar problem. There is a straight green line down the centre of the screen, and the picture to the right is funny. Dark areas have a green tint, light areas are kind of pink, colours are generally distorted.
Set was manufactured Sept 2006, and purchased Oct 2006. In the spring of 2008 it would get a slim green line down the centre of the screen, which would disappear after being on a few minutes. Eventually it got to where it is now, with one half of the screen permanently impaired.
I took the back off, and played a hair dryer over the boards, since the problem used to clear up after it had been on a while, but that made no difference. I have removed the TCON board, and cleaned the LDVS connection, and both ribbon cables that go to the panel, with no change. My next step is probably going to a refrigerant spray, followed by more disassembly to get at the tabs.
I tried to link some photos in the test section, but could not get them to link properly. Does this symptom of a very distinct and sharp vertical line down the centre of the screen sound more like a TCON, tab contact , or maybe a physical panel problem? Just for a hoot, I tried the factory reset the other day (up arrow on the remote/power off at the set), and the picture came up perfectly, but only for about 4 hrs. I had tried this in the past, and as expected it did nothing, which is what I had expected when I tried it last time. I was shocked when it looked fine.