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 PREVIOUSLY BLENDED AREA ON AFT SERVICE DOOR(R2) LOWER SILL BEAM. AFT SERVICE DOOR (R2) LOWER SILL BEAM REMOVED AND REPLACED, IAW EMB 170 SRM 51-43-02 AND 51-43-01. A/C REMAINS IN CHECK.