Honestly, with the milling sound out of warranty.... my suggestion is to turn the radio up and ignore it.
You can likely drive for 50k+ more miles before it's an actual problem
requiring replacement.
To note, this is not something you want to DIY unless you're familiar with Tesla's firmware, drive unit pairing, traction control calibration, etc. These are NOT plug and play. You also don't want to replace it with a crappy secondhand unit that'll just do the same thing again eventually, since Tesla eventually corrected this issue with the large drive units. While there's a few others out there who could likely make a replacement unit "work", there's really a lot of steps that aren't obvious that are needed to do it
right. So, you'll really only want to have this done at Tesla, or with us at 057. We've done dozens of drive unit replacements over the past couple of years.
Last I saw, Tesla's pricing for out-of-warranty performance drive unit replacement (parts+labor) was around $8500.
If/when you do want to get it replaced, since you're in Charlotte only an hour away from us, drop us a line over at
057tech.com/contact (include your VIN) and we'll look into options for you.