As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LCQ - MAJOR REPAIR - DURING C-12 CHECK INTERGRANULAR CORROSION WAS FOUND NUMEROUS FASTENER HOLES ON FORWARD CARGO COMPARTMENT LOWER DOOR SILL WEB BETWEEN BS 440 TO BS 480. MAINTENANCE REMOVED CORRODED LOWER DOOR SILL WEB FROM BS 440 TO BS 480; FABRICATED A NEW REPLACEMENT WEB PER DWG 65-20726; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02 FIG 9.