As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER LANDING, FLIGHT CREW NOTICED A LARGER AMOUNT OF OIL LEAKING FROM NR 1 ENG. THEY VERIFIED THE OIL CAP AND CONFIRMED THAT IT WAS TIGHT. AFTER THE AME INSP, IT WAS DISCOVERED THAT THE OIL CAP WAS CRACKED. CAP WAS REPLACED AND ACFT RETURNED TO SERVICE.