As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C18 CHECK DISCOVERED VERTICAL BEAM WEB CRACKED AT AFT SIDE OF 178 BULKHEAD AT BL 5.7L, WL 177 AND BS 178. MAINTENANCE CUT OUT AND REMOVED DAMAGED PART OF WEB IAW BOEING 737-300 SRM 53-10-08-2R12. FABRICATED REPAIR WEB AND SHIMS IAW BOEING 737-300 SRM 53-10-08-2R12. INSTALLED FABRICATED REPAIR PARTS AT AFT SIDE OF 178 BULKHEAD AT BL 5.7L, WL 177 AND BS 178 IAW BOEING 737-300 SRM 53-10-08-2R12.