What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION ON FWD FUSELAGE FLOOR STRUCTURE, RT INBOARD SEAT TRACK BEAM AT FR 17. FUSELAGE FLOOR STRUCTURE RT INBOARD SEAT TRACK BEAM AT FR 17 REPLACED, IAW EMB SRM 51-43-01 AND SRM 51-41-02. A/C REMAINS IN CHECK.