As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5638 AFTER REMOVAL WASTE DRAIN VALVE ( AFT VALVE ) CORROSION WAS FOUND ON CUTOUT INTERNAL DOUBLER AT AFT WASTE PAN . IN REF. NRC 00238. CORRECTIVE ACTION: SUMMARY OF NRC 00257, DOUBLER AT AFT WASTE PAN WAS REPLACED PER DWG 146N3650 REV. AH AND B757-200 SRM. (2478209)