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 FOUND ON REAR FUSELAGE FLOOR STRUCTURE STIFFENER AT FR89-90. FLOOR STRUCTURE SUPPORT STIFFENER AT FR89-90 FOUND CORRODED WAS REMOVED AND REPLACED IAW EMB 170 SRM 51-41-01. A/C REMAINS IN CHECK.