Curiouser and curiouser, which came first, loss of oil from the MGB or damage to the T/R Drive? I would have thought that when the MGB lost it's oil the epicyclic gearing would have failed first because of the torque loading, but perhaps the T/R Drive gearing failed because metal particles dropping from the epicyclic contaminated the T/R Drive enough to break up the gears.
A major concern is the reported failure of the flotation system.
It is also understood that the flotation beacons did not operate, in my old company the beacons were wrapped in the liferafts so if the liferafts were not manually deployed no beacons. Automatic deployment of the beacons without the liferafts should be considered, this may also be relevant in the case of Air France 447.