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 PREVIOUSLY BLENDED AREA AT CENTER FUSELAGE III AFT PASSENGER DOOR (L2) LOWER SILL BEAM. AFT PASSENGER DOOR (L2) LOWER SILL BEAM REMOVED AND REPLACED, IAW EMB 170 SRM 51-43-02 AND SRM 51-43-01. A/C REMAINS IN CHECK.