As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER LANDING, OIL WAS FOUND ALL OVER TAIL GEARBOX AREA, MAINTENANCE WAS CALLED AND T/R G/B WAS REPLACED WITH A RENTAL AND NO FURTHER PROBLEM WAS FOUND. UPON INSPECTION AT MAIN BASE THE VENT HOLE ON THE INPUT WAS FOUND PLUGGED UP , THIS WE FEEL WAS THE CAUSE OF THE MAG SEAL TO BECOME DISLODGED AND BEGIN LEAKING. THIS GEARBOX WAS CLOSE TO O/H SO IT WAS SENT IN EARLY AND NEW SEAL WAS INSTALLED.