As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*** WHILE AIRCRAFT WAS IN FOR HEAVY CHECK *** MAINTENANCE REPORTED LEVEL 2 CORROSION ON THE CENTER FUSELAGE III FLOOR SUPPORT STRUCTURE GUSSET PLATE AT FR89, RH SIDE. MAINTENANCE REMOVED & REPLACED THE CENTER FUSELAGE III FLOOR SUPPORT STRUCTURE GUSSET PLATE AT FR89, RH SIDE IAW EMB SRM 51-41-02. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.