What was found
MAIN CABIN FLOOR SUPPORT, AFT RIGHT DOOR INTERCOASTAL UPPER SURFACE (ADJACENT TO RIGHT LAVATORY AFT FLOOR MOUNT FITTING) HAS CORROSION (STA 947.5- 967). MARKED AND DOTTED. GROUNDED - YES. REMOVED CORROSIONS AREA'S 2(EA) MARK ON INTERCOSTAL. ORIG MAT. 080, REMOVE MAT. 042 AND REMAINING MAT. 038. FOUND TO OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-1 AND SRM 53-70-51-0I-1. REMOVED AND INSTALLED NEW INTERCOSTAL IN MAIN CABIN AFT WET AREA AT STA. 967-STA. 947 R/H IAW B737-800 SRM 51-40-02. BAC DWG#147A5650 REV:A.