As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-18 CHECK CORROSION WAS FOUND ON L-1 DOOR SILL LOWER INNER CHORD AT LBL 58, BETWEEN BS 298 AND BS 343, WL 208. MAINTENANCE REMOVED DAMAGED SECTION OF L-1 DOOR SILL LOWER INNER CHORD AT LBL 58, FROM BS 298 TO BS 343; FABRICATED A NEW REPLACEMENT SECTION OF INNER CHORD PER DWG 65-17688; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02.