What was found
(CAN) PILOT REPORTED NR 1 ENGINE WAS RUNNING ROUGH. MAINTENANCE FOUND OIL LEAKS AND EVIDENCE OF COMBUSTION DETONATION AT NR 1 CYLINDER. FURTHER INSPECTION FOUND NR 36 STUD WAS PULLED OUT OF THE CRANKCASE THREADS. THE NR 1 CYLINDER BORE IN THE CRANKCASE WAS FOUND CRACKED FROM NR 35 STUD THREADS UP INTO THE CYLINER BORE. THE ENGINE WAS REMOVED FOR REPAIR AND A FACTORY REMANUFACTURED ENGINE WAS INSTALLED.