So, not fully resolved yet. Dealer said they pulled sample of fluid and it was fine. They said they were stored codes and weren't currently repeating. They had put some miles on it and were going to do more hoping for a repeat. Wasn't feeling good about how easy this would be to diagnose and was very frustrated with my choice to encourage the wife into a Jeep.
I left work early today and came home. (wife and kids at Legoland, FL - they were on the way there when the CEL Service DEF came on - so U-turn, return and swap for loaner at dealer and they headed back out)
I've never been so happy to have "fluid" on my garage floor as I was when I pulled in. A drip pattern of crystalized DEF right underneath where the injector is, along with a few drops leading out of the garage and into the drive.
Called the dealer and the tech is rechecking the injector and the connection from hose to injector. So I'm hoping that DEF pump turned on to spray some in and it was blocked/loose and it's an easy fix (assuming parts availability... fingers crossed on that front.) I always though DEF was sprayed constantly, apparently not! Either way, DEF getting sprayed, just not sprayed in, is a lot easier to track down than a code with no apparent reason.
I'll let you know what they say but I'm willing to grant some latitude for manufacturing errors... it IS an AWESOME vehicle.
And yes, I know I need to repaint the garage floor. That's been on the list for a while