What was found
FUSELAGE SKIN AFT OF FORWARD LAVATORY SERVICE PANEL FOUND WITH CRACKS AROUND AREA FASTENERS DUE TO CORROSION. 2024-T3 O.O40 INCH FUSELAGE SKIN AT STATION 312 RT SIDE, BETWEEN STRINGERS S-19 AND S-21 CORRODED. UNDERLYING BEAR STRAP, FRAME AND STRINGERS NOT AFFECTED. CORROSION DOES NOT AFFECT LAP JOINT AT STRINGER S-19. SUSPECT CAUSE OF CORROSION DUE TO LAVATORY FLUID CONTAMINATION. AFFECTED FUSELAGE SKIN REMOVED BETWEEN STATIONS 305 AND 319, BETWEEN STRINGERS S-19 AND S-21, APPROXIMATE SKIN AREA 152 INCHES SQUARE. LOCAL CORROSION REMOVED AND EXTERNAL SKIN DOUBLER AND TRIPLER INSTALLED PER SRM 53-30-3, FIGURE 3 REPAIR.