As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEAL LEAKAGE WAS NOTED TO BE INCREASING OVER TIME AND SEAL WAS CHANGED WHEN OIL BEGAN ACCUMULATING ON THE ENGINE DECK FOLLOWING A DAYS WORTH OF FLIGHTS. THIS SEAL WAS A HISTORY OF LEAK DEVELOPMENT AND USUALLY WILL BE CHANGED SEVERAL TIMES BEFORE ENGINE REACHES ITS NORMAL OVERHAUL INTERVAL. IN SOME CASES THE SEAL NEVER LEAKS. EXAMINATION OF THE SEAL CARBON FACE AND RUNNER RARELY EXHIBITS ANY NOTICEABLE DEFECT. (K)