For anyone having problems with some hd channels with no sound. you need to use echanelizer to edit the audio PIDs.
change the info for each of the channels as follows an all should work with audio again. I think you have to turn auto scan off on ABM or it will just revert to the old settings each time it runs.
Sky Living HD, Video 274, Audio 386, Video Type 1, Audio Type AC3
E4 HD, Video 277, Audio 389, Video Type 1, Audio Type AC3
More4 HD, Video 278, Audio 390, Video Type 1, Audio Type AC3
Film4 HD, Video 279, Audio 391, Video Type 1, Audio Type AC3
Tick the top 3 checkboxes under flags on each channel for this to work also.