Heard from the SC. My rear drive unit has failed. They have a replacement onsite and should be able to get that finished in a day or so.
I mentioned two other issues on drop-off as well - the driver profiles don't work (after my wife applies hers, when I get into the car and apply mine, about half the pre-programmed items (seat, mirror, steering wheel, etc.,) revert to my saved positions. The others are completely out of place and require a manual adjustment. Also, the Easy Entry settings are then erased and the car appear to adopt my wife's profile for them. I assume that's the case because now when I put the car in park, the driver's seat pushes forwards about 4 inches. Of course, I can reprogram everything, but certainly shouldn't have to.
I also mentioned my auto-wipers. They simply don't work. After driving the loaner home, I sent another email comparing the loaner vehicle's wiper operations to mine - the loaner's works as they should. Mine aren't aggressive enough, even in the high setting, to keep the windshield clear. As to this item, the SC replied that AP1 cars (the loaner) and AP2.5 cars (mine) have different hardware to support the auto-wipers - and that my wipers are working as designed, and their operation will be refined via firmware. A reasonable, yet not wholly acceptable explanation.