I just got rid of my 32XBR100 because of that same issue. The light colored lines on mine were getting progressively worse, so we decided to make the move to a HD flat screen (a great move by the way). The problem for us was the tuner section in the feature box. At first, I bought a Motorola signal amplifier, and that helped quite a bit, but gradually the lines came back and I ended up removing the amplifier. I know it was the tuner going bad, because if we ran the incoming cable signal through our old VCR using it as the tuner, then out to the tv, then the picture was perfect again.
So, I don't know if they are repairable or not, but you could contact a Sony repair center to see. LOL, for whatever reason, I kept the feature box & cable, 2 remotes, and the manual, but not the tv.