After ten days in the Sunnyvale, CA, service center I got my MX back. Long list of repairs under warranty. Ok, my VIN is 0017XX so I'm not totally surprised. But when I went down the list I see that they replace BOTH front half shafts. Wow. I didn't have any vibration or other issues as described by others. They just replaced them. They also replaced the door latches, again I didn't have any issues. They invoice says replace door latches with updated part. So it appears they are just replacing these things as a matter of course without any complaints from me. Way to go Tesla.
Regarding the length of time. I did bring it on Dec 26 so they were down people, plus then the New Years holiday. So I was Ok that it took so long.