I came across this video describing the DIY procedure to R&R the "drive unit fluid" in a Tesla S P85.
I expect the procedure for Model 3 to be similar.
As expected, the hardest part is dealing with those "push-pins" when removing and re-assembling the under-chassis plastic trim pieces.
From the video explanation notes:
Doing the first drive unit fluid service on a 2013 Tesla Model S P85. This is a quick guide to help do it on your own, as it is not at all difficult. A fluid evacuator pump is absolutely the best tool for this job (https://www.amazon.com/Mityvac-7201-F...). The only required fluids are DexronVI Automatic Transmission Fluid. 1.5 qts (1.4L) for the large units, and 2.4 qts (2.3L) for the small units. This is for 2012 to 2016 Model S cars, RWD or AWD, as we are only servicing the rear unit in this video.
Another DIY video, servicing the (Brembo) brake calipers on a Tesla Model S.
From the comments section:
They have the Tesla logo on the front, but they are Brembo calipers, pads, and rotors. They are standard on all cars up to 2016.5, when they only offered 4 wheel Brembos on performance cars, and front wheel Brembo on all others.