As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4372 - DURING APPROACH TO BOS, EXPERIENCED FAILURE OF THE HYDRAULIC SYSTEM. THE HYDRAULIC PUMP AND MOTOR ASSEMBLY WERE REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. TEARDOWN OF THE ELECTRIC MOTOR FOUND THE ARMATURE BEARING HAD FAILED. BEARING P/N 102729N1 AND 400431N1 WERE BOTH REPORTED AS HAVING 'WORN GREASE'. THE UNIT WAS REPAIRED AND RETURNED TO SERVICE. (M)