As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AMO RECEIVED SG AND FOUND THE A.D.E. BEARING TO BE NOISY AND ROUGH AND ALSO UNAPPROVED. PROPER OEM BEARINGS INSTALLED P/N 03-6009-23. ARMATURE WAS THEN RESURFACED, BALANCED AND BRUSHES WERE SEATED. UNAPPROVED BEARINGS WERE QUARANTINED.