As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL OF NR 1 AND NR 3 CYLINDERS FOR MAINTENANCE, INTERNAL INSPECTION OF THE CAMSHAFT AND TAPPET BODIES REVEALED EXCESSIVELY WORN CAMSHAFT LOBE AT THE NR 3 INTAKE POSITION. THE TAPPET BODY WHICH CONTACTS AND RIDES ON THE CAMSHAFT LOBE WAS HEAVILY SPALLED ON THE FACE OF THE TAPPET BODY AS WELL.