Update: called Tesla service center for an update today. They said, "car is still in diagnosis with an expected estimated completion of 3pm tomorrow". This is my first Tesla, when they give a service completion estimate do they usually hit it or miss it?
Love the car, I just want to drive it! However, tomorrow will be day 3 in the shop, and my 7th day of ownership. What would you do?
Thats a tough one. Since tomorrow is your 7th day of ownership, I think if I were in your shoes I would honestly ask to replace the car. Problem is, I doubt they have one of identical spec "laying around" so you might end up having to go back in the queue so to speak. If I was to replace it, I would think that, although teslas policy is to not allow someone to order the same car again, my feeling is the intent is to stop people from rejecting car after car because of (minor to tesla, major to the purchaser) issues.
Since this is a documented issue, and they have been unable to fix it or even tell you what the problem is, I would ask to talk to the manager at the delivery center and explain the issue to them (that the car broke down shortly after getting home, cant be driven, and the SC has not been even able to diagnose the problem), and that I was uncomfortable because the 7 days is up and I have not even had a chance to try out the car, and is there a similar spec vehicle I can replace it with?
Of course, this also depends on how you paid. If you paid cash, not much issue for you, just paperwork for tesla. If you got outside financing, then more of an issue, because they might have to unwind that one, etc etc.
You could always let them fix it as well, thats not a poor choice either... and if this happened for a regular car dealer that would be your only choice. If this happened after week 2, it would also kind of be your only choice... but this is week 1 while you still have an option.
Im not trying to push you either way, just answering fully "what would you do".
The above is likely what I would do.