Hey all - had my drive unit replaced this summer in a very new Model S 70 (RWD) in Boston while up in Eastern Canada. (amazing A+++ service story - will save for another time) 4 month old car worked fine, but got a battery error message - told to contact service. There had been an issue with some sort of high voltage cable which they replaced and they replaced the drive unit out of caution as a result. Oddly though, there is now a sort of whine coming from the rear of the car at between 40 and 50 MPH with 43-47 as the sweet spot. The original unit was pretty much dead silent, so this was a surprise. At first I suspected tire noise due to a rotation, but this is not the case. I've lived with this new noise since July, the car works perfectly and I finally got around to asking if anyone else has ever noticed this. Thanks!