As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) VACUUM PUMP GASKET FAILED IN-FLIGHT CAUSED OIL LOSS FROM NR 1 ENGINE. THE ENGINE WAS SHUT DOWN. AIRCRAFT RETURNED TO ITS DEPARTURE POINT. POST-FLIGHT INSPECTION CONFIRMED FAILURE. NEW VACUUM PUMP GASKET WAS INSTALLED AND THE AIRCRAFT RETURNED TO SERVICE.