As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-05 CHECK CORROSION WAS FOUND ON FORWARD CARGO COMPARTMENT THRESHOLD INBOARD WEB SILL BETWEEN BS 440 AND BS 492, STR 25 RT. MAINTENANCE REMOVED CORRODED WEB FROM BS 440 TO BS 492, STR 25 RT; FABRICATED A NEW REPLACEMENT WEB PER DWG 65-20726; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG 8 AND 12.