Found a nest of these Tesla Service Bulletins on the NHTSA website. The link is https://static.nhtsa.gov/odi/tsbs/2015/SB-10057892-9567.pdf PDF also attached. Interesting note is that lubricant for the rear drive unit is 1.4 liters of "DEXRON VI, SYN, 212B" Condition - Some rear drive units were produced with inadequate grease, which could lead to a “clunk” sound during accelerator pedal transitions or a “hum” noise during high speed driving. Over time, this could lead to premature wear out of the drive unit evidenced by slower than normal acceleration or lack of acceleration at drive initiation. Correction - Remove and replace the rear drive unit.