Thanks. I am curious if Customer Care was misinformed in saying the cars had to be taken to Service Centers for the final steps of the 3.3.1 update and, if so, why the release notes wouldn't simply have said the work could be done either by a Service Center of a Mobile Technician.
However, it won't actually matter in my case. Our first Gravity is at a Service Center, anyway, having its rear drive unit replaced and a replaced HUD calibrated (if they can get the unit to accept the necessary software that it is thus far refusing to recognize), and they will do the 3.3.1 update there. Our second Gravity has already had 3.3.1 downloaded at the factory, where it is now waiting for transport to us.