As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION ON REAR FUSELAGE FLOOR STRUCTURE LH GUSSET PLATE AT FR90. FUSELAGE FLOOR STRUCTURE LH GUSSET PLATE AT FR90 FOUND CORRODED HAS BEEN REMOVED AND REPLACED IAW EMB SRM 51-41-02. A/C REMAINS IN CHECK.