What was found
MAIN CABIN AFT WET AREA STA 947-967 LBL 27 INTERCOSTAL CORRODED. GROUNDED - YES. REMOVED CORRODED INTERCOSTAL BS 947-967 LBL27 AND 2 EACH FLOOR SUPPORTS IAW B737-800 SRM 51-40-02. LOCATED AND DRILLED NEW P/N#147A5660-3 INTERCOSTAL AND INSTALLED INTERCOSTAL AND 2EA SUPPORTS IAW B737-800 SRM-51-40-05, B737-800 SRM 51-40-02 BAC DWG#147A5660 REV- B737-800 AIPC 53-42-51-25B . ORIGINAL MAT'L THICKNESS .080, REMOVED .016, REMAINING .064. FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-01.