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 CFIII FLOOR STRUCTURE, CORROSION FOUND ON PREVIOUS REPAIR AT LH UPPER BEAM BETWEEN FR87-89. CORRODED PREVIOUS REPAIR AT LH UPPER BEAM BETWEEN FR87-89, REPLACED IAW EMB 170 SRM 53-23-10 AND 51-43-04.