We dropped our X off at the Rocklin, CA, USA service center on Feb. 16th, and received notification that service was completed today. We had a few items that we asked our service techs to check on and repair (loss of driver profiles due to miscalibration of front and rear seats, windshield wiper blades not covering lower portion of driver side windshield), and there were a few Tesla originated items on their list (replacement of front door latches, replacement of sun visors). We dropped "Dona Bella" off with 15,684 miles on it, got a loaner S 85 for our 300+ mile trip home, and today received notice that the vehicle service was complete. What was of major interest to us on the invoice was the measurement of tire tread depth. Outer tread depth on all 4 tires was 7/32, center depth on front tires was 8/32, rear tires was 7/32, but inner depth clearly had taken a hit - 4/32 on front tires, 3/32 on rears. We are speculating about why there was such a discrepancy. Could it be related to towing a trailer for 7000 miles? Could it be misaligned tires? The service notes indicate a 4 wheel alignment was performed during the visit, but I'm sure going to be watching that tire depth more closely. Total cost for the service was $625. The car is being shipped to us on Monday.