As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, METAL CONTAMINATION WAS DISCOVERED IN OIL FILTER. A CHECK OF VALVELIFT WAS DONE AND IT WAS DISCOVERED THAT NR5 AND NR6 INTAKE LOBES WERE EXCESSIVE. NR6 CYLINDER WAS REMOVED AND DAMAGE OBSERVED ON THE CAM LOBES AND TAPPET FOLLOWERS. NOTE: THIS IS THE 14TH ENGINE IN 3 YEARS. LUBRICATION PRACTICES HAVE BEEN MONITORED/ POOR QUALITY CONTROL ON NITRIDING.