What was found
DURING M CHECK, CORROSION WAS FOUND ON THE CABIN FLOOR STRUCTURE LONGITUDINAL AT FR 15A-18, -Y953. REPLACED SEAT TRACK PER DRAWINGS F53114437,F53114410,F53116745,F53111987,F5311 0720, F25310257,F53116751,F53111243,F53114695, F53114450 AND SRM 51-42-11 REV 91.