What was found
AFT CARGO AREA SURROUND WASTE TANK MAIN DRAIN SHOWS HAVING CORROSION SPOTS INSIDE WEB ENCLOSURE STA 847 TO STA 867 AND LBL 25 APROX. DOT 82-132. AND STRINGERS 25 AND 23 L/H; WL APROX. 165.5 / REMOVED CORRORED INNER CHANNEL AND ASSY PAN FROM AFT CARGO COMP. SURROUND WASTE TANK MAIN DRAIN; PER REF B737 SRM 51-40-020-0G-0; LOCATED AND DRILLED NEW CHANNEL PER REF B737 SRM 51-40-05-0G-0 INSTALLED INNER PAN ASSY WITH NEW CHANNEL PER REF B737 SRM 51-40-02-0G-0_AND DRAWING #146A7402