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-05 CHECK CORROSION WAS FOUND ON LOWER SURFACE OF FORWARD CARGO DOOR LOWER SILL WEB BETWEEN BS 447 AND BS 488, AT RBL 28. MAINTENANCE REMOVED CORRODED FORWARD CARGO DOOR LOWER SILL WEB FROM BS 447 TO BS 488, AT RBL 28; FABRICATED A NEW REPLACEMENT SILL WEB PER DWG 65-20726; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02.