I recently started hearing a flapping noise under the car. When I looked underneath the front aero shield was hanging down on one corner and looks like it was cracked towards the back. Looking at it closer, I noticed a bolt was missing that should of been holding it up. I ducted taped it up and scheduled a service center appt. There has also been a rattle in the hatch and passenger door that needed to be fixed. They sent me a cost estimate of 387.38 to fix. Shouldn't this be covered under warranty? The bolt was either loose or not put on at the plant or maybe they had to take that off when the SC did an alignment. Either way, bolts shouldn't just come loose like that. They want me to approve the estimate which I feel that I shouldn't need to pay anything. Is this normal for Tesla?