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 R-1 DOOR SILL INNER CHORD BETWEEN BS 291 AND BS 356, RBL 59, WL 208. MAINTENANCE REMOVED CORRODED R-1 DOOR SILL INNER CHORD FROM BS 291 TO BS 356, RBL 59; FABRICATED A NEW REPLACEMENT CHORD PER DWG 65-45875-45; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02.