What was found
DURING HEAVY CHECK MAINTENANCE FOUND INTERNAL FUSELAGE, CENTER SECTION III, CORROSION FOUND ON FLOOR SUPPORT SHEAR PLATE BETWEEN FR87-88 AND BETWEEN RH/LH IB SEAT TRACKS. CORRODED FLOOR SUPPORT SHEAR PLATE BETWEEN FR87-88 AND BETWEEN RH/LH IB SEAT TRACKS REPLACED WITH NEW IAW SRM 51-42-01.