As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 1 ENGINE OIL QUANTITY DROPPED TO 3.5 DURING FLIGHT. AIRCRAFT LANDED. INVESTIGATION REVEALED A LOOSE B-NUT ON A LINE ON THE ENGINE. THE NR 1 ENGINE FUEL PUMP HAD BEEN REPLACED PRIOR TO THE FLIGHT AND THE LINE MAY HAVE BEEN DISTURBED THEN AND NOT CORRECTLY TIGHTENED.