As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, LOW CYLINDER COMPRESSION WAS DETECTED DURING THE COMPRESSION CHECK. THE CYLINDER WAS REMOVED AND A VISUAL INSPECTION PEFORMED ON THE CAMSHAFT. DETERMINED BOTH NR 3 AND NR 4 INTAKE LOBES AND TAPPET FACES WERE DAMAGED. SUBMITTER STATED THIS IS THE FOURTEENTH SUCH OCCURRENCE IN APPROXIMATELY 2-1/2 YEARS FOR THIS OPERATOR. (X)