A success story for me if anyone needs guidance...
My new Model Y was delivered and on day 1 had a pretty annoying high pitched whine, consistent from the 50-70mph range. It was hard to determine where exactly it was coming from as the sound would kind of envelope the whole cabin. It wasn't super loud, but sounded like I was getting my ears checked, and it was enough to hear over music, and was overall a real annoyance as I am a highway commuter. I thought I could just live with it, but after riding in a friends Y that was silent, I decided to bring it into service at 1,500 miles and hoped for the best.
Before dropping off the car, I took two rides with Tesla technicians to diagnose, and they determined the sound was not normal, and I received a loaner while they tried to repair. Worst case they said would need a full replacement of the drive unit.
The following day, I received notice that the repair was complete. The fix was "Seal - Perimeter - HV Battery (remove and replace)".
It's only been a few days but I am happy to report that the sound is no longer noticeable, job well done.