I have noticed in the last few days that I get no sound on channel 74 (7Food) through my TiVo, in Melbourne.
I used to get sound on 7Food through that TiVo in recent weeks.
I also get no sound on channel 75 (not that I care about openshop). I do get sound on 7, 7mate, 7two.
I tried another TiVo, and have the same issue on that (no sound on 74 & 75).
I have a TV using the same antenna, and that has sound for channel 74.

Has anyone else seen this problem? Or have suggestions?