As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) REPORT OF PROBLEMS WITH CRANKSHAFT BALANCING R & O SHOP LED OWNER TO GROUND HIS AIRCRAFT AND REMOVE THE CRANKSHAFT FOR MPI INSPECTION. CRACKS WERE FOUND AROUND 80 PERCENT OF THE NR 4 CRANKPIN RADIUS. SIGNS OF OVERHEATING WERE ALSO PRESENT ON THE SURFACE OF THE MAIN JOURNAL. THE CRANKSHAFT WAS REPLACED.