My company's video tech, Mike Parker in MD (a forum member) performs the mod. We spent 5 hours tracing the circuts and fiquring out what to do. I believe he removes two levels of filtering. The difference (improvement)on a good CRT (Electrohome 8000, 8500, 8500LC, 9500LC)is staggering. Very significant with the DWIN 700 too. The unit is sharp as a teck with the mod. It is very soft above trippled TV with out it and is soft at trippled TV. The warranty is not an issue as long as it is dealer performed (at least that is what the techs at FE have told us). The issue is academic as to performing the mod in the future as FE will exchange the .10 for free with the better newer unit when it comes out.