In addition to my previous post, I've seen references to people cleaning a light engine. Does anyone have a link to a general guide to doing so (i'm a computer engineer, just haven't been inside a TV in 20 years), or if not is this really something someone would do on their own meaning that I could sell my yellow-tinted light engine PT50LC14 TV on crags list or ebay or if the light engine is bad does it just go into the trash?