No audio on only 1 channel

Does anyone know how to fix this? I have a TivoHD and receive analog cable. This weekend I noticed that ESPN had no audio. If I turn the volume up about 10 settings higher than I usually need, I can hear faint audio with a lot of static. This is the only channel being affected. All other channels have the same audio as usual. When I watch ESPN directly through my TV (bypass the Tivo), the audio is fine.

I've tried rebooting the Tivo, resetting the audio settings to default stereo, and switching from an HDMI to component cables. None of that worked. Has anyone ever encountered a problem like this before? Any suggestions? Thanks.