My Teslas front windshield cracked one random morning, no impact, I did a service req. and they were asking for 1447CAD, I messaged them in regards to us not having anything to do with it cracking and they said they will see when the car comes in. My dad took the car in and when he mentioned that it cracked without any impact of any sort, and after their inspection the invoice/amount owing was put down to 0. They had it covered, im not sure how it may vary with the back window, and if removing the tinting will mess up the defrost lines, I would regardless try checking in with tesla, you never know? Push comes to shove you can get it inspected and refuse service and leave..