I have to give praise to Dedham, MA Tesla service department today. I woke up this morning to find a crack in the roof of my 2week old Model S. It looked like a stress fracture and it was about 8inches long starting at the join at the back of the sliding part of the roof. I called Tesla support and then the Dedham service dept. They asked me to pop in, which I did this afternoon and they took a look. I was expecting them to say one of the following 1) Its not covered under warranty, etc. 2) We will order the part and you will have to come back in a couple of weeks. Instead they said 'Yep, covered under warranty and replacing it now, grab a coffee'. I was out of there in under an hour, refreshed from the coffee and with a shiny new sunroof. Great work, great service.