As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GASKET FAILED NEAR MOUNTING STUD, ALLOWING OIL UNDER PRESSURE TO ESCAPE OVERBOARD, RESULTING IN LOSS OF OIL PRESSURE AND SUBSEQUENT EMERGENCY OFF AIRPORT LANDING. THE VACUUM PUMP WAS INSTALLED NEW IN DECEMBER 1998 AND HAS BEEN IN SERVICE FOR 826.3 HOURS. THE GASKET WAS FURNISHED NEW WITH THE VACUUM PUMP.