As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING LEAK CHECK OF THE FUEL OIL COOLER, FOUND OUTLET MANIFOLD ASSEMBLY (LOCATED ON THE TOP OF THE COOLER) AND THE FUEL-OIL COOLER BYPASS VALVE (LOCATED ON THE BOTTOM OF THE COOLER) LEAKING OIL. RPL'D SEAL PLATE ON FUEL OIL BYPASS VLV. REPLACED O-RING ON OUTLET MANIFOLD, RUN CKS OK. RESERVICED ENG OIL FULL.