So I had "Car Needs Service, Contact Tesla Service" pop up on my display a couple of weeks ago. Last week I brought my car in and they said it was an "SD Card fault"... I didn't know the car even had an SD card, but I guess it uses one to store maps (at least). I did notice that my maps were being a bit wonky, showing some coastal roads falling into the ocean, but I didn't think much of it. Anyways, they tried to hard reboot fuse 51, and formatted my SD Card as well, and it seems the maps are saved correctly now. One other thing they found, without my asking, was that my park assist was not working. I had previously tried to use it to no avail, but since I'm pretty good at parallel parking, it didn't dawn on me to ask when I dropped it off. Anyways, per my service receipt, they found a sensor not secured well in the front bumper, and glued it into place. Haven't had time to try it yet, but I will report back if it works now. I just recall seeing a few people saying that their park assist didn't work at all, and though this might help.