As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING PRE-FLIGHT INSP, PILOT DISCOVERED OIL BEING SPRAYED UNDER THE OIL SERVICE DOOR IN THE TOP COWLING. MX REMOVED COWLING AND NO VISUAL CLUES SUGGESTED WHERE OIL MIGHT BE SPRAYING FROM. ENG CRANKCASE PRESSURED AND AIR WAS HEARD HISSING FROM THE FRONT OF THE ENG. A LARGE CRACK WAS FOUND PROBAGATING FROM A NR 3 CYL STUD TO THE CENTER LINE OF THE CRANKCASE. ENG SHOP CONFIRMED THIS TO BE A COMMON AREA ON THIS MODEL ENG. CRANKCASE WAS REPLACED.