As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C13 CHECK DISCOVERED STIFFENER CRACKED AT AFT SIDE OF BS 328, BL 45L AND WL 206. MAINTENANCE REMOVED STIFFENER IAW BOEING 737-300 SRM 51-40-02-0G. FABRICATED STIFFENER IAW BOEING DRAWING 65-45812. INSTALLED FABRICATED REPAIR PARTS AT BS 328, BL 45L AND WL 206 IAW BOEING 737-300 SRM 51-40-02-0G FIGS 8 AND 12.