As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPARENTLY, DID NOT GET CHIP PLUG TURNED AND LOCKED PROPERLY DURING 25-HOUR CHIP CHECK. UPON INSPECTION, FOUND CHIP PLUG OUT OF THE SOCKET. APPARENTLY,THE VALVE IN THE PLUG HOUSING DID NOT SEAT AND ALLOWED FOR A LARGE OIL LEAK. SUBMITTER RECOMMENDED AFTER TURNING THE CHIP PLUG TO LOCK, A FIRM PULL DOWN ON PLUG TO ASSURE IT IS DEFINITELY LOCKED.