I have a 811hd reciever and a 511pvr (I believe that's the correct one).
In the last week, I've started to loose channels. Upon investigating, here's the transponders I do and do not get:
119 - Dead - 1,2,3,4,5,6,7,8,9,10,12,14,16,18
Alive - 11,13,15,17,19 and 21
110 - Dead...