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 EXFOLIATION CORROSION WAS FOUND ON STIFFENER JUST FORWARD OF BS 294 AT STR 26 LT. MAINTENANCE REMOVED CORRODED STIFFENER BS 294, STR 26 LT; FABRICATED A NEW REPLACEMENT STIFFENER PER DWG 65-45808; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02 FIG 12 PG 45.