Today I noticed a very long crack in my rear roof glass, about 2’ long or so. I have no idea where it came from, and there are no clear marks to show where it originated from or what the initial impact might have been from what I can tell. Tesla is quoting me just over $1,500 Canadian to get it fixed. Just wondering if this is something that must be done by Tesla, or if I should be looking at other options? Does that cost estimate sound about right? It seems really expensive to me, but what do I know?