Update: Got mine replaced. A couple things.
1) The Gnex's port is separateable from the motherboard, so they were able to replace it (quickly) in the store for the $35 fee. So that's good.
2) They claimed my issues, which were not charging, always showing as charging, or cutting out intermittently as charging, were caused by corrosion on the connection, which was apparently from water damage. This is weird because I never got any water on any of my connectors at any point.
So anyway I seem to be back up and running on JB goodness. Now I just need a wifi connection and my laptop to really get some work done.