My '13 is sitting at the dealership waiting for parts right now. Rear passenger side started leaking with less than 4k on it.
I discovered it after making a 4 hour road trip. It wasn't whining or anything, but the dealer said they wanted to replace the diff in it. Not sure if it leaked enough to damage the rear.
Pretty discouraging after 15 years of trouble free Toyota and Nissan pickups.