As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNDER NORMAL OPERATIONS THE ENGINE DEVELOPED ALMOST ALL SPALLED VALVE LIFTERS AND CAM TO THE DEGREE NEEDING REPLACEMENT OF ALL LIFTERS AND THE CAM. TIME SINCE REBUILD 1092 HRS. THIS IS THE 3RD ENGINE TO SUFFER THIS TYPE OF OCCURRENCE IN 3 YRS. CAUSE IS UNKNOWN. FACTORY REP WAS CONSULTED.