Tivo HD with an M-Card were installed Saturday. It was the first M-Card the two guys had done. It took a total of 20 min, and seemed to be a complete success... Then I noticed that 727 UHD is not working on either tuner after they had left. This is the only channel that does not work. I mostly get a grey screen and sometimes a "this channel is not availible". I called Comcast and they did the Init, Hit, Refresh thing, to no avail.