I've spent quite a lot of time investigating problems on my own LCD RPTV which were similar to yours, I was experiencing red and blue stains on certain parts of the screen. My TV is a Sony KL50W2 and I went through a couple of replacements before I got one that was perfect. Recently the problem has returned but I gained a LOT of knowledge from the American forums about a condition they call green fog! This could be what you are experiencing. Its all down to dust. No matter how great the extraction is on an RPTV there is ALWAYS dust somewhere. I can only relate my own findings but they may be of relevance in your situation, I'm sure there is some common ground here. Firstly, I removed the lamp assembly (as you would if you were going to replace the lamp) and ensured that the lamp itself was clean. Secondly, I checked for dust contamination on the prism assembly (where the lamp shines directly into it) but this was OK. I then removed the two access hatches at either side of the rear of the set which allowed me to see into the cabinet. I shone a torch in and noticed some dust on the lens assembly, this was gently removed with a lens cloth. At no time did I touch the mirror, it is inverted and therefore unlikely to have much dust on it anyway, my suggestion would be to leave it well alone unless it is obviously dirty, mine was spotless. This reduced the fault dramatically. I'd say that it was approximately 50% less noticeable than before, but still there. I have read on the US forums that there is one other rather unusual trick to try that has resulted in most faults being eliminated 100%. This involves a can of compressed air being blown over the optical assembly. I know what you're thinking, these units are covered and sealed therefore dust should not be a problem. WRONG. Bizzarely, it cures the problem. There are no real instructions on how to do it or why it works but it does, just spray the general area and bingo! Most people who try it also notice a marked improvement in brightness and colour saturation. Please bear in mind that I have yet to try this so I cannot confirm what I have read is true, but according to others it does seem to work. Rest assured though that I will certainly be trying it out. I hope this has helped or at least pointed you in the right direction. One other thing. I had a CRT RPTV for a few years and thought it was pretty good but once I saw how clear and detailed an LCD TV looked I was sold on it straight away. The picture is sharp and makes CRT look positively fuzzy and, dare I say it, out of focus. All convergence and geometry issues disappear, there is no 'chicken wire' and dvd's look great. Buying a CRT RPTV would be a step backwards in my opinion.