I bought my 942 used. It was used back east and I'm on the west coast. When I search for programs the guide is still pulling up "W" channels from when it was used in Detroit along with the "K" channels I need here in California. It's kinda irritating because the "W" channels don't come in (blank screen) and my daughter keeps setting timers to record on them. How can I make channels I don't/can't recieve go away? I already have my guide set to display "all sub" but that didn't help.