Symptoms I had before: A loud hum coming from drive train when decelerating (lift foot of accelerator).
28000km (17500 miles)
2012 model
Dealer carried out the following under extended warranty:
Gearbox:
Diff:
Repairs took 5 weeks. $1729 at current exchange rate.
Noise is gone after the repairs. Gearbox is much smoother, all the stiffness that we experience in low temp is gone. Gears feel very secure.