As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON POSTFLIGHT, OIL WAS DISCOVERED ON THE RIGHT ENGINE COWLING. O-RING ON OIL TANK CAP WAS FOUND ROLLED. INSPECTED O-RING WITH NO DEFECTS NOTED. RESEATED O-RING AND OIL CAP. PERFORMED ENGINE RUN WITH NO LEAKS FOUND. PERFORMED ETOPS VERIFICATION FLIGHT WITH OPS NORMAL. OIL CONSUMPTION WAS FOUND TO BE 1 QUART LOWER THAN NORMAL. O-RING HAS BEEN REPLACED.