As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE ENGINE DEVELOPED A NOISE INDICATING A WORN CAM LOBE OR ROLLER. SMALL AMOUNT OF METAL (STEEL ) FOUND IN ENGINE SUMP. TRACE AMOUNT OF METAL FOUND IN OIL SCREEN. CAM REMOVED AND FOUND TO BE DAMAGED ON ONE EXHAUST LOBE. INSTALLED NEW CAM AND ROLLERS ON EXHAUST TAPPET ASSY. ENGINE GROUND RUN SATISFACTORY. FLIGHT TEST WAS SATISFACTORY. SUMPS AND SCREENS RECHECKED NO METAL PRESENT.