Had a installer over upgraded my receivers from 622's to 722k's while he was here I had him tweak my signal, he ran a check switch. Every thing was working but the were some red writing and a code said two of my lnb's where failing. He replaced them no extra charge. Have a friend with the same setup, from the reading I have done he has what is lnb drifting. A lnb going back. I would like to run that check for him but am not sure what to look for. Has 110, 119 129 on a dish 1000 with 3 signal lnb's with dual out puts ,going into a dp34 switch. Any help would be great thanks.