I put up a second sat for my inlaws locals. I have a 90 signal for 148. How ever when their locals are tuned, it says that the channels have been lost on the 148 sat and transponder 12. At one point a screen popped up and said the channel you are trying to view is not available in your area. Any ideas what the problem could be? Their receiver is a dishnet 721 that was just sent to them as a replacement about a month ago.