What was found
DURING B INSPECTION FOUND THE SERVICE DOOR CENTER SILL HAS CORROSION AROUND ALL 3 NUT PLATE HOLES (MARKED). THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE SERVICE DOOR CENTER SILL WITH SERVICEABLE CENTER SILL AND RESTORED PROTECTIVE COATING IAW EMB SRM 51-40-02, CPM 51-21-05, CPM 51-21-06, AEA ETN-GN-51-016R2, ETN-EM-51-075 AND ETN-EM-51-091R2. THE AIRCRAFT WAS RETURNED TO SERVICE.