I have a fault of multiple red lines across the screen of a Philips back projection set. Philips say that as the model is not on the system the cannot advise me. The model number is 48UP91 0503. It was made in the USA, bought at Comet 4 1/2 years ago and has 3 scarts and a multistandard tuner. Has anyone heard of this set or advise me who might know more of the story on this set?