What was found
FOUR EACH OF THESE BOLTS HOLD THE OIL COOLER TO RT BAFFLE. TWO OF THESE BOLTS FAILED LEAVING ONLY THE TWO INBD BOLTS SECURING THE OIL COOLER. FAILURE WAS DISCOVERED AT OIL CHANGE. THIS IS THE P/N CESSNA CALLS FOR IN THE IPM (ILLUSTATED PARTS MANUAL). BOTH BOLT SHANKS WERE FOUND IN THE LOWER COWL ALONG WITH THE NUTS. BOLTS FAILED AT THE FRILLED HOLE IN SHANK LEAVING TIP OF BOLT IN NUT. TOTAL TIME 6,500 PLUS HOURS.