As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUE TO FAILED DIFFERENTIAL CYLINDER LEAK CHECK OF CYLINDER NR 2 AT SCHEDULED 50 HR OIL CHANGE, DEFECTIVE ROCKER ARM AND PUSHROD WERE DISCOVERED. VISUALLY INSPECTED ALL ROCKER ARMS AND PUSHRODS AND FOUND EXCESSIVE WEAR. DEFECT APPEARS TO BE DUE TO OIL STARVATION, CAUSING EXCESSIVE VALVE LASH AND CHATTERING. OIL USED XC20W50, TIME SINCE LAST OIL CHANGE AND OIL ANALYSIS 49 HOURS WITH NO ABNORMALITIES.