What was found
DURING C-4 CHECK, INSPECTION REPORTED LOWER WEB FROM LAVATORY FLOOR TO FUSELAGE ON LT. SIDE OF FUSELAGE CORRODED AROUND CUTOUTS, STA. 277 TO STA. 294.5. FABRICATED AND INSTALLED REPLACEMENT DOUBLER PER SRM 53-10-01, 51-40-02 AND SOPM 20-41-02.