As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT, THE NUMBER ONE ENGINE OIL QUANTITY AND PRESSURE WERE FOUND LOW AND IN THE YELLOW ARC ON THE INDICATOR. THE FLIGHT CREW COMPLIED WITH ENGINE SHUT DOWN, PROCEDURES ON APPROACH. AIRCRAFT DIVERTED. THE OIL VENT LINE WAS FOUND LOOSE AT THE GEARBOX. THE LINE WAS TIGHTENED AND THE ENGINE WAS RUN TO 90 PERCENT N1. OPERATIONAL AND LEAK CHECKED GOOD.