I was actually able to fix one of the 711-726 problems today. This only works if the affected card is NOT the primary.
I had originally set up the pending card as a Sony Sat T60, and got the message to change from 711 to 726. Frustrated, I started messing with the mirroring flags.
His primary was fine and had 3 additionals. The one messed up was a tivo, an RCA DVR40.
I turned all the mirrors off, and then disconnected the services on the account (since the primary was working okay it allowed me to do this). Then I disconnected all of the working cards, and forced the bad card to be the primary. At that point I went back, readded all of the other cards, then selected a new primary as one of the working IRDs.
I opened a new billing window, and did the same process again.
I think I went back and forth like this between the 2 windows about 5 times out of frustration.
When I had the original primary set back to the primary, I reinstated the services, and told him to put his original access card back in.
It was still giving us camc errors, but his programming was on and everything working on his end.
I wasnt able to try this again to confirm it a working method rather than some coincidence, as the other calls with this problem had the primary card was the bad one to begin with, and so I was unable to disconnect services on them.
If any other tech runs into one of these where the primary is fine and a secondary is the messed up one, try this method and see if it gets anywhere.