Yeah - both tuners appear to be working, in fact right now I have a game that is recording, was watching Live TV, paused Live-TV, jumped over and started to watch game, was able to watch game just fine, went back to Live-TV and picked up where I left off.
It's maddening, this only happens when the game ends before the 6 hour window is up. It stops recroding when the broadcast is complete, then begins to continue to record the 771 for the remaning time. So I end up with 2 recordings, one is supposed to be the game the other is the dead air. But the game ends up not working.