I have a hr21-700 and a slimline dish. I am getting 771 error codes on these channels. 92, 202, 209, 242, 244, 273, 278, 282, 325, 327, 331, 504, 518, 520, 544, 607, & 612 that I know of. My install was originaly done for a 4 box system but after realizing that my dvr had an rf remote i cancelled the other 3 boxes. So I have 4 cables running from my dish into the house where my lone reciever now sits. When the 771 error message comes up and I switch from one set of cables to the other set the error goes away and everything works fine for a day or so then I have to switch back. Do I have a bad receiver? LNB? Should I disconect the other two cables at the dish? Should they be capped off? Do these channels share a sat. or have any connection to each other to explain why only these channels have this problem? Any suggestions would be greatly appreciated!