As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE OUTER CHORD OF THE C1 DOOR LOWER SILL WAS FOUND CORRODED. TO REPLACE THE CHORD, THE FS 620 FRAME OUTER CHORD AND WEB WERE CUT AND LOWER ENDS REMOVED. A NEW SILL CHORD WAS INSTALLED AND LOWER FRAME SECTION REINSTALLED WITH REPAIR ANGLE SPLICES. THE WORK WAS ACCOMPLISHED PER ER/A 383339-14, REV A.