As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON ARRIVAL, NR 1 ENG FOUND WITH AN EXTENSIVE OIL AND GREASE LEAK FROM THE AFT SIDE OF THE PROPELLER. CONSULTED WITH THE PROPELLER MANUFACTURER AND THE CROSS HEAD SEAL BACK RING IS SUSPECTED, TO BE VERIFIED UPON TEARDOWN OF THE REMOVED PROPELLER. PROPELLER ASSY WAS REPLACED AND THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE.