So I recently received an HR54 as a replacement for a failed HR44. Yes, in the past i was of course NOT able to receive 4k programming with the HR44.... I have a C61K client and can view Channel 105, 106 live 4K events without issue... enjoyed an Avalanche hockey game the other night. My issue however is channel 104. I keep getting an error 721. I've tried for several hours with DirecTV reps who simply want to re-send the signal to my receiver, or claim it is not in my package. Not getting much help. Any suggestions or ideas? I have a case open with the Office of the President, however so far they too are stumped. Thx.