What was found
MAIN CABIN FWD WET AREA CORROSION AT INTERCOSTAL UPPER SURFACE STA 312+5' LBL 12'<[01] REMOVED AND REPLACED NEW INTERCOSTAL ON STA 312 LBL 12 AS PER BOEING 737-700-SRM 51-40-02-0G-0;[02] REMOVED AND REPLACED NEW INTERCOSTAL ON STA 312 LBL 12 AS PER BOEING 737-700-SRM 51-40-02-0G-0 AND DRAWING 141A5400;[03] VERIFIED INSTALLATION OF INTERCOSTAL AT STA 312 LBL 12 MAIN CABIN FLOOR STRUCTURE.;[04] RII: CERTIFIED REMOVAL AND INSTALLATION OF INTERCOSTAL AT MAIN CABIN FLOOR STRUCTURE STA 312 LBL 12.