I think the chronology is that 5 USA had a SID 7710 on 10964. Channel moved to 11307(while still being transmitted on 10964). Was labelled 2102 and had a SID of 2102. Is now labelled 5 USA and has a SID of 2102. The old label 2102 is still present and now has a SID of 7710 - which is obviously not present on the new transponder and therefore doesn't tune. I think C5/RedBee are just making a b***s of the transition to the new transponder.