What was found
(AIRCRAFT NOT GROUNDED) (DEFECT DISCOVERED DURING AC HEAVY MX VISIT) PASSENGER CABIN FLOOR STRUCTURE, CORROSION FOUND ON SEAT TRACK AT FR16 AND Y1292. / PASSENGER CABIN FLOOR STRUCTURE, SEAT TRACK BTW FR 12-24 AT Y1292 REPLACED AS PER SRM 51-72-11-911-001 REV.159"