As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT DFW, NR 1 ENGINE OIL QUANTITY INDICATED CONSTANT DECREASE OIL. LANDED WITH 1.0 GALLONS OIL RETURNED DIRECT, UPON LANDING WITNESSED OIL LEAKING FROM COWLING. FOUND OIL CAP NOT ENGAGED. SERVICED ENGINE INSTALLED NEW OIL CAP REF 12-13-01.