What was found
FWD MAIN CABIN FLOOR SUPPORT, U-CHANNEL UPPER SKIN HAS CORROSION , LBL 11.16, BS 270- BS277. GROUNDED - YES. REMOVED CORROSION FROM THE UPPER SURFACE OF THE INTERCOSTAL LOCATED IN THE FORWARD WET AREA AT STA 270- STA 277, LBL 11.16, WL 208.10, ORIGINAL THICKNESS 0.080", REMOVED 0.011", REMAINING THICKNESS 0.069" FOUND OUT OF LIMITS IAW B737-800 SRM 53-10-51-1A-1.REMOVED AND REPLACED THE INTERCOSTAL, PART #141A5670-12, PO: 1042381.1 IAW BOEING DRAWING 141A5600 REV N SHEET 1. REMOVED AND RE-INSTALLED CABLE BRACKET AND TENSION WAS NOT DISTURBED.