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 U-CHANNEL (STIFFENER) AT BS 1113 ON RT SIDE 3.5 INCH FROM BOTTOM, STR 17 RT. MAINTENANCE REMOVED CORRODED STIFFENER AT BS 1113, STR 17 RT; FABRICATED A NEW REPLACEMENT STIFFENER PER DWG 65-46579; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02.