As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE PILOT HEARD A LOUD WHINING SOUND FROM THE ENGINE. MX FOUND THE WHINING STARTED AT 850 PROP RPM. THE RGB CHIP AND THE MAIN OIL FILTER WAS EXAMINED AND CLASS 3 UNACCEPTABLE DEBRIS IAW MM CHAP 79 WAS FOUND. THIS COUPLED WITH THE NOISE FROM THE ENGINE RESULTED IN THE ENGINE BEING REMOVED AND SENT TO AN APPROVED MAINTENANCE FACILITY. NO RESULTS FROM THE INVESTIGATION ARE YET AVAILABLE.