As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON RETURN OF FLIGHT, MECHANIC NOTICED SUBSTANTIAL AMOUNT OF OIL ON THE BELLY OF ACFT. UPON INVESTIGATION, FOUND A FITTING (AN912-1D) THAT EXITS THE OIL COOLER WAS CRACKED IN HALF. THIS ENGINE HAS BEEN RECONFIGURED TO A FLIGHTCRAFT TURBO, TURBO NORMALIZED SYSTEM. IT IS RECOMMENDED THIS FITTING SHOULD BE REPLACED WITH ONE MANUFACTURED FROM STEEL.