I am trying to diagnose what is wrong with my parents' S3 Tivo. Running two Moto S-cards, Charter Cable, everything had been running great for months. Now on one of the tuner's, all analog channels appear like a weak OTA HD signal would, with massive blocking and mpeg artifacts. Digital channels are just fine. My initial hunch is that the MPEG-2 encoder for that particular tuner has crapped out. I've tried hard reboots of the unit, restarts, and nothing helps. Its definitely not a cable signal problem, as the other tuner works just fine on all analog and digital channels. This also is not what so many on here have reported about a "range of analogs missing". So I guess what else could/should I try before calling into Tivo and requesting a replacement unit?