What was found
IAH- DURING "C" CHECK IT WAS NOTED THAT THE FLOOR BEAM CROSS STRUCTURE ABOVE FUSELAGE FRAME 23 WAS CORRODED AT THE INBOARD FORWARD CORNER. IAH- MAINTENANCE REMOVED THE DAMAGED AREA,AND, INSTALLED A DOUBLER WITH A FILLER,AND, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE WHEN RELEASED FROM "C" CHECK.