Hey Mike and Don -
Just went through the same situation with Samsung regarding my TX-P2675WH that is 2.5 years old and has the issue with the QAM tuner. Being in VT, we were late to market with local HD, and when it came, I got so involved trying to get the antenna to work, that I forgot to check the QAM. And you know what happened when I checked the QAM tuner...
So, I called Samsung and stated that it should work and doesn't, and that others have reported this, etc. I said I wanted to get the update and was told there was none. Guy told me to fax in copies of my receipt, a letter explaining the issue and any links to websites where I read about it. I put it all together and sent it off. Spoke to the Executive Custer Care people where I went back and forth about whether or not there is a firmware fix for the QAM issue. Got the Tech 2 people to finally state there was a fix, but it was hurting more than helping, and that when they got around to making a functioning update, new tv's were coming out so they scrapped it. After going back and forth for a while between the tech and Executive Customer Care people, they finally told me that they would replace my tv with the 2007 TX-T3092 (or 3093, my choice) 30" SlimFit CRT tv at no cost. Typically they said it would cost $180 for an upgrade, plus they wanted to depreciate my tv 20% a year (which I've had for 2.5 years, though this is based off their price, not what you paid). The rep I spoke with was names Steve Perfetto and he was great to work with. His supervisor said that I should have paid the $180 upgrade fee, she couldn't take away what Steve offered me. I recommend calling the ECC line at 1-800-747-5618 and see if you can get to Steve and let him know the situation. Hopefully he can help anyone else out who is just finding out about this know.
Oh, and the replacement TV comes with a 1 year warranty from Samsung.