As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6041 - BOS-LGA - AIRCRAFT HAD AN 'A' SYSTEM HYDRAULIC FAILURE ON THE INSPECTION OF THE OUTBOARD FLAP DRIVE MOTOR, THE DRIVE SHAFT SEAL RETAINING PLATE WAS FOUND TO HAVE '1' SCREW MISSING, WHICH CAUSED THE SEAL TO FAIL. LOSS OF 'A' SYSTEM HYDRAULIC FLUID AIRCRAFT RETURNED TO BOS. REPLACED OUTBOARD FLAP DRIVE MOTOR IAW 29-51-62 MM. OPERATIONAL CHECK SYSTEM MM 29-51-62. (M)