Similar problem with Screen. Left device in its case on my dashboard while parked in covered garage. Came back 4 hours later. No explanation of how crack might have occurred. Crack begins on left side of screen fans out from edge like a windshield impact crack...but no evidence of impact to screen or either edge of case at origin point of crack.
I tried this link
Official Nexus Help Center where you can find tips and tutorials on using Nexus and other answers to frequently asked questions.
support.google.com
and spoke to "Timothy". They will email me back the serial number and reply re warranty info from both GOOGLE and ASUS. Repairs will be made by ASUS. Here is the link:
ASUS Service | North America. There was no discussion of whether warranties will apply and I didn't ask. I would expect they would have to take a look at my cracked screen either way to make that call!