I'm almost to 18k miles, probably will hit it sometime this weekend. Had the first "annual service" around 17k miles a while back and I figure now is a good time to post about how it's going.
Tesla took care of all my issues during the service, including replacing the windshield that got hit by a rock. Gasket in the door is now properly secured to the car, rubber cover missing over the tail light bolt was replaced (I actually found the other one in my trunk and replaced it). Back seat click went away on its own for the most part, but occasionally it comes back, I think their theory that it's a seat belt is accurate now. They worked on my passenger seat, during the ride with the shop foreman (who remembers me and my car, which I find amazing considering how many cars they must see) noticed it wasn't down tight and would creek as he moved in the seat and replaced the clip on the bottom of the seat. They fixed all the rattles that I had, car is nearly silent now except for some very occasional creaks and wind noise. I'd say that everything has settled down and the car is now in great shape.
I'm super happy with the car. Can't wait for auto steering update.
Ohh and 319 Wh/mile lifetime.