As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE SPEED RECEIVED LT ENG OPERATION WARNING MESSAGE AND OIL PRESSURE INDICATED 25-36 PSI. MESSAGE RECURRED AND PRESSURE DROPPED TO 25 PSI SEVERAL TIMES IN FLIGHT. INSPECTED NR 1 ENG AND FOUND OIL LEAKING FROM SCAVENGE FILTER. UPON REMOVING FILTER FOUND O-RING MISSING. REPLACED O-RING AND FILTER IAW AMM 79-21-05. LEAK CHECK GOOD. (S)