As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION FOUND NUT MISSING FROM NR 6 CYLINDER THROUGH STUD, UPPER FORWARD STUD. FOUND NUT IN BOTTOM OF COWLING. NUT WAS SPLIT. REMOVED ENGINE FOR INTERNAL INSPECTION DUE TO LOSS OF CRANKSHAFT BEARING PRELOAD. 42.9 HOURS SINCE LAST ANNUAL.