Just got the fixed Tegra board back and installed it! Thank you
@appleguru for helping me out with it. Special shout-out for being very communicative and answering all my questions throughout the process. Excellent work and highly recommended!
For those who are in 2 minds - do it ASAP as a preventative measure. I had ZERO signs of failure, no random reboots, no slowdowns, nothing. Only random 3G connectivity issues that I had was fixed after upgrading to LTE. In fact, even my browser was working (for simple google searches / checking menus of restaurants). It just died all of a sudden. Working perfectly at night, next day morning - black screen / dead. Still had mobile connectivity, but couldn't take any actions from the app. Based on
@appleguru's analysis, the main firmware partitions were very corrupted and had to be flashed from a fresh copy of the firmware and the user data partitions were also corrupted, but fully recoverable (luckily, since I removed it as soon as it failed without waiting too long).
So please take it seriously even if you are not showing *much* signs of damage, and get it replaced soon.
EV-Fixme, Appleguru & others here are excellent to work with if you want to go the community route!
Getting it replaced through Tesla is also cheaper now than before (around $1100) with 2 yr warranty, but there is a 3-4 week wait at many SCs, so be prepared to wait in such cases.