As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C18 CHECK DISCOVERED CHANNEL CRACKED IN 2 PLACES AT WL 207, BL 47L BS 313 AND BS 327. MAINTENANCE REMOVED DAMAGE CHANNEL AT BS 313 AND BS 327 IAW BOEING 737-300 SRM 51-40-02-0G FIG 8. PREPPED NEW CHANNEL FOR INSTALLATION IAW BOEING 737-300 SRM 51-40-05-0G FIG 4 AND FIG 7. INSTALLED FABRICATED REPAIR PARTS AT WL 207, BL 47L BS 313 AND BS 327 IAW BOEING 737-300 SRM 51-40-02-0G.