As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFTT WAS IN HEAVY CHECK MAINTENANCE FOUND THE AFT WET AREA FLOOR SUPPORT AT FRAME 84 CORRODED. MAINTENANCE REMOVED AND REPLACED THE FLOOR SUPPORT AT FRAME 84 IAW EMB 170 SRM 51-41-01, AND 51-41-02. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.