What was found
CORROSION ON FLOOR SUPPORT AT FWD PASSENGER CABIN BS294+7 LBL12 WL208. / [01] VERIFIED APPLICABILITY AS PER SRM 53-10-51-1A-1. CORROSION ON FLOOR SUPPORT / INTERCOSTAL WAS FOUND OUT OF LIMIT DUE NO DAMAGE IS PERMITTED ON UPPER CHORD INTERCOSTAL HARD MOUNT/ATTACHMENT; IAW SRM 53-10-51-1A-1; STEP 1.B(4);[02] REMOVED FLOOR SUPPORT INTERCOSTAL BETWEEN BS 294 TO BS 312 LBL 11.16 PER SRM 51-40-02;[03] LOCATED AND DRILLED NEW INTERCOSTAL P/N 141A5690U1 AT FLOOR SUPPORT STRUCTURE FWD PASSENGER CABIN BS 294 TO BS 312 LBL 11.16 PER SRM 51-40-02 AND DWG 141A5600.<BR>OK TO INSTALL ALL PARTS;[04] VERIFIED CORRECTIVE ACTION STEP 4. VERIFIED OK TO INSTALL ALL PARTS.;[05] UPDATED STEPS 1 ; 2 AND 3;[06] INSTALLED NEW INTERCOSTAL P/N 141A5690U1 AT FWD PASSENGER CABIN BS 294 TO BS 312 LBL 11.16 WL208. PER SRM 51-40-02 AND DWG 141A5600;[07] UPDATED PARTS USAGE;[08] VERIFIED CORRECTIVE ACTION #6.;[09] VERIFIED MEASUREMENT FIELD.