Can't complete guided setup (S308)

Been struggling with this a while. I have two Premier units. One is working fine, and the other just isn't cooperating. Spend hours on the phone w/ Tivo, and they can't figure it out and submitted a 'ticket' for me. Still no call back from tivo, etc.

Background:
1 Lifetime Service Tivo. Was having some issues the past few weeks with it saying it couldn't reach tivo service.
2 Did a manual connect and it connected fine, no failures
3 Did a port test, no failures.
4 Tivo is direct connected to router, and I did do a location swap with the working tivo.

Out of desperation, I did a Clear and Delete everything. I go through guided setup and everything seems to go ok, until the last step of the Guided setup where it goes to Verify. It errors out and does the S308.

I tried with OTA only, Cable Only, Cable and Antenna, same result each time.

I also got a fresh image and a new HDD and tried it there. Same result.

I'm beginning to think it could be some hardware issue, but I don't know where to begin. I do not use a cable card, and i would be happy if I could just get this one to do OTA.

Any suggestions? I've literally done every network troubleshooting I can with Tivo support and myself. I'm confident it isn't a home network issue since the other identical Tivo has no issues at all.

Thanks!