What was found
DURING HEAVY CHECK, AFT CENTER FUSELAGE III FRAME 86-88 RIGHT SIDE FLOORBEAM HAS CORROSION AS MARKED EFFECTING THE CROSSBEAM. BLENDED OUT DAMAGE FOUND OUT OF LIMITS, REMOVED AND REPLACED RT SHEAR PANEL AT FR 86-88 REF SRM 51-40-02, SRM 53-23-10. AIRCRAFT REMAINS IN HEAVY CHECK BNA.