I've had a PLV30 for over a year now, and its done around 3000 hours, (and the new bulb at 2000 was a nasty surprise - 250 quid - in yours dreams, more like 400) and I have a large area of the screen that is taking on a slowly increasing yellow cast that I first noticed around 1500 hours. It covers a roughly circular area in the centre 1/3 of the screen, and is just about the colour of a tobacco Cokin Filter (sort of smokey yellow to the non-photgraphic nuts). It's nothing to do with pixels, and started as a barely noticeable cast only visible when the screen was showing flat white or grey, now it's becoming more noticeable. Its as if there is something deposited on the optics somehwere. No-one in the house smokes, changing the bulb made no difference at all, and I've checked and cleaned all the accessble parts, including inside the lamp housing. Anyone got any ideas?