As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING AT SS69 PASSENGER INFORMED THE PILOT THERE WAS OIL ALL ALONG THE SIDE OF THE AIRCRAFT. SHUTDOWN AND CHECKED THE TRANSMISSION OIL LEVEL AND THE SIGHT GLASS WAS EMPTY. MAINTENANCE REMOVED AND REPLACED THE MAIN TRANSMISSION EXTERNAL OIL FILTER MANIFOLD ASSEMBLY BECAUSE TEMPERATURE BULB INSERT WAS DAMAGED CAUSING LEAK. GROUND RUN AND LEAK CHECK WAS GOOD, AIRCAFT RETURNED TO SERVICE. (K)