As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS ALTERNATOR IS AN ELETROSYSTEMS NEW UNIT. THE O-RING GROOVE WAS MACHINED INCORRECTLY ON THE ALU-23 SPACER ALLOWING ENGINE OIL TO LEAK PAST THE XA-744AZ O-RING AND CONTAMINATING THE X-4087 DRIVE END BEARING. THIS ALTERNATOR WAS REMOVED FOR A 500-HOUR BEARING INSPECTION WHEN THIS DEFECT WAS FOUND.