It IS a known issue, and for the OP the new receiver and tech visit will not yield any change.
What the issue actually is has yet to be mentioned, so I cannot say how easy or hard the fix is. The original thread for this issue has been monitored by both Matt and myself, and we ask DAILY for updates on what the issue is (if found) and if there is an ETA for the fix. I personally was not aware of the missing channels until the original thread showed up on 2/6, so I apologize I didn't report the issue until then. We have also escalated the links for both threads up the chain.