I've had the unfortunate experience of an early drive unit failure on my P85D at 384 miles on the clock. The SC has replaced the rear drive unit with a re-manufactured unit and returned the car. It seems to drive fine, but I notice a combination of two prominent high pitched whines that I don't recall from the original unit before the failure. a). The first varies in frequency with motor (vehicle) speed and increases in amplitude with power level. It seems to come from the rear. I do recall a similar (quieter) tone from the front motor before the replacement but this is much louder - such that I can't hear the front motor at all. b). The second only occurs at high power (either accelerating or regenerating) and is louder and more constant in amplitude than a)., but also varies in frequency with vehicle speed. Is this the famed "balloon squeal?" I have let the SC know I believe these are new, but am somewhat concerned they may tell me they are normal. Unfortunately my time in the D with the original drive unit was limited, so I want to be sure I am not "hearing things". So two questions: 1). Have you heard these sounds, or are you still amazed by the incredible quiet as I was initially (frankly all I can remember hearing was road/tire noise and a faint whine from the front motor). 2). I'm trying not to be "that guy" but I'm a little disappointed that I have a car with less than 400 miles and they used a re-manufactured unit for the repair. I suspect they are "allowed" to do so by the new vehicle warranty, but particularly given the checkered history of the earlier drive units that a new unit would not be an unreasonable expectation in this situation. Thoughts ?