2014 model, right around 40K miles. Took it in to the dealer due to a noise from the rear end. Dealer diagnosed this as a rear differential failure. Replacement only as they consider this a non-serviceable item. Replacement differential retails over $3000. The car was purchased by my brother in law used, so there is no warranty coverage available. We removed the differential and decided to take it apart, what did we have to lose? This is what we found when we opened it up.