As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT CURRENTLY IN A C-CHECK STATUS AND CORROSION WAS FOUND UNDER THE SVC DOOR THRESHOLD PLATE AROUND THE NUT PLATES. MX REMOVED AND REPLACED SVC DOOR THRESHOLD SILL IAE SRM 51-40-02. ALL WORK WAS ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.