Gregg will be coming to my home near the end of the year to calibrate my new Hitachi Plasma display. Regardless of the answer to my question(s) below, I am still going through with the ISF calibration because there are some things that I simply cannot solve with my remote user menu. Digress: I solved a "blurry red credit" problem with my DVD player menu (of all things), by simply adjusting the chroma delay setting - moving it moved straight lines of the credits so that they are either perfectly formed letters, "ghosting" to the left, or "ghosting" to the right; I thought it was an SVM problem, but according to Hitachi, SVM on their plasmas is not an issue because they do not use SVM in "drawing" the picture on their screens, as is done with CRT units. BTW - I have never seen a DVD player (I recently purchased the Onkyo DV-SP800) with so many settings that can be made to a picture; it is akin to a service menu mode on a TV - no kidding. Back to my subject . . . I have a three year warranty on my TV. Just based on reading the posts on the HTF and the AVS forum, one of the first things ISF calibrators recommend is removal of the protective screen. Next, they obviously go into the service mode (and from what I understand, this is "registered" by the TV so that when the service mode is again accessed, the second person to do so will know that he was not first) and adjust TV settings accordingly. What happens to my warranty after the ISF calibration? What if a major malfunction occurs with my TV that is CLEARLY covered by warranty (such as a 25% loss of pixels) and the service man comes by and sees that my TV not only has been accessed via the service mode, but it no longer looks like the TV I purchased (i.e., it is missing the protective screen)? I ask because a plasma TV (such as the one I just purchased) is a relatively major investment (I see good second-hand cars that sell for less). As I said in the title of the thread - I am NOT posting this thread to discourage ISF calibrations. Hell, I am getting one myself. I am simply curious about experiences others may have had with warranty calls made AFTER ISF calibrations and the response by the service department when then discovered that an ISF calibration had occurred.