As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7679 - MMLM TO LAX - DURING FLIGHT CREW REPORTED E1 OIL PRESSURE FELL - DROPPED SUDDENLY TO 2 QUARTS. E1 WAS SECURED IN FLIGHT. A/C LANDED IN LAX WITHOUT INCIDENTS WITH A SINGLE ENGINE APPROACH. MX COMPLIED WITH TROUBLESHOOTING AND FOUND OIL PRESSURE LINE FROM ACCESSORY GEAR BOX TO REGULATING VALVE CHAFED. MX REMOVED AND REPLACED E1 OIL PRESSURE LINE, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED TO RETURN FOR SERVICE.