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OK. Just thought I'd throw out a few ideas.
The cool thing about digital OTA TV is that every sub-channel can have multiple audio tracks associated with it. For analog TV, there was only one optional alternative audio channel (hence the term "second audio program"). With digital TV, you can have many audio tracks (more like a DVD) with all kinds of possibilities (e.g., 5.1 channel surround sound, alternate languages, director's commentaries, music-only tracks, etc.).
I just thought it would be worth checking to see if one of the TVs has accidentally defaulted to an alternate audio track that happens to be empty (perhaps an encoding mistake at the studio) or in a format that the TV doesn't know how to decode (e.g., DTS).
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