As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE RUNNING ROUGH UNDER POWER AND NR 5 CYLINDER MONITOR COOLER THAN THE REST. DURING INSPECTION, FOUND FOUR CYLINDER STUDS MISSING AND A GAP BETWEEN CYLINDER BASE AND CRANKCASE. PERFORMED A DYE PENETRATE CHECK ON CASE AND FOUND A CRACK ON FWD TOP STUD.