As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE MAINTENANCE, THE OIL PRESSURE TREND WAS NOTICED TO HAVE DROPPED ABOUT 12 PSI IN RECENT DAYS. THIS TOGETHER WITH A BAD OIL SAMPLE INDICATED A PLANETARY CARRIER PROBLEM AS EXPERIENCED IN THE PAST BY THIS OPERATOR. THE ENGINE GEARBOX WAS DISASSEMBLED AND THE PLANETARY GEAR CARRIER WAS FOUND CRACKED. THE CRACKS ORIGINATED FROM THE OIL GALLERY PASSAGES. THE ENGINE WAS REMOVED FOR REPAIR.