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 CENTER FUSELAGE III FLOOR STRUCTURE RH GUSSET PLATE AT FR90. RH GUSSET PLATE FLOOR STRUCTURE @ FR90 FOUND CORRODED HAS BEEN REMOVED AND REPLACED IAW EMB 170 SRM 51-41-02. A/C REMAINS IN CHECK.