To help me and others get a better feel for the fight you might have to go through to get the situation resolved, how close is your truck to the max VIN number specified in the TSB? What was your build date? What are your symptoms, and how is the best way to reproduce the problem for your issue?
I don't want to sound like a S.O.B. on an inquisition, but I sincerely would like to know a bit more about your situation, and how close you are to the borderline to where others might have problems. I have seen other threads on this site where items were switched between vehicles on the lot by the dealers, and I wonder if this might be a case of that.
My opinion is that if you to pop the 4 corner pieces of your dash radio panel to check the labels of the stereo, this WILL NOT void your warranty, because you are neither adding nor removing objects that will positively or negatively affect the factory performance of the radio or anything else in the dash. It's kind of like removing the bolt on the transmission oil dipstick. It was installed by the factory. My salesman told me that to check the level myself, that I have to remove that bolt, check the level, reinstall that bolt. If I see that there's a problem with the level, then see the dealer.
Be careful, however, because all the controls for the radio, AC, and the airbag light are mounted directly to that panel, and they are attached to wires running back from there.