That channel definately only has AC3 audio, at least right now.
I checked the entire mux, and there aren't any other audio streams that aren't associated with one of the other channels, and only the AC3 PID is associated with that channel 10.
I thought that perhaps the PMT might incorrectly designate it as AC3, so I made a manual channel designating that audio PID as mpeg instead of AC3, and I got no audio out of it, whereas designating it as AC3, I get audio.
So at least right now, it is AC3, and only AC3. Perhaps at some other time they had switched to mpeg, or had a 2nd PID present. I assume that the audio PID producing the audio is APID=47 ?