I brought my P85 in for its two year service this past week. One of my complaints was that I was hearing a whine that started at about 10mph and was hearable up to about 30mph. It went away if I was slowing. Not too bad, but a bit annoying. It took the tech about 10 seconds of test driving to tell me that I was hearing the infamous "milling" sound. So they replaced the drive unit (with a remanufactured rev P). I was a bit surprised to run into this as I hadn't heard any complaints on the forums about the problem for quite a while. They do seem to be quite confident that their current remanufactured drives are not going to have this problem again. I remain very pleased with Tesla service.