As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLAP TRACK WING SKIN AND BACKUP FITTING HOLE CORROSION. REPAIR IS ACCOMPLISHED BY REPLACING THE ORIGINAL BUSHINGS EXCEPT THE OUTER DIAMETER IS INCREASED TO COMPENSATE FOR THE HOLE BORE DIAMETER INCREASE. THIS REPAIR IS APPROVED BY THE BOEING COMPANY PER ECRA N639FE-57-B747-012-EAC.