As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TRANSMISSION OIL PRESSURE DROP (2) BARS BELOW THE GREEN. ON ROUTE BACK TO BASE THE TRANSMISSION OIL LOW PRESSURE LIGHT CAME ON UPON LANDING. THE ENGINE DECK IS COVERED WITH OIL. THE FREEWHEEL AFT SEAL HAD POPPED OUT OF ITS BORE, RESULTING IN A LOSS OF OIL. (TC NR 20070411001)