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 FLOOR SHEAR TIE CRACKED AT BS 196, BL 29R AND WL 207. MAINTENANCE REMOVED CRACKED SHEAR TIE IAW BOEING 737-300 SRM 51-40-02-0G. FABRICATED NEW SHEAR TIE AND PREPPED FOR INSTALLATION IAW BOEING 737-300 SRM 51-40-05-0G. INSTALLED FABRICATED REPAIR PARTS IAW BOEING 737-300 SRM 51-40-05-0G AND 51-40-02-0G FIG 12.