As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C19 CHECK DISCOVERED CORROSION ON FLOORBEAM STRAP AT BS 1024 TO BS 1029 AND BL 3R. CORROSION WAS FOUND TO BE OUT OF LIMITS IAW BOEING 737-300 SRM 53-60-51-1A1. REMOVED AND INSTALLED FABRICATED REPLACEMENT FLOORBEAM STRAP FROM BS 1024 TO BS 1029 AND AT BL 3R IAW BOEING 737-300 SRM 51-40-05-0G FIG 2.