As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-21 CHECK FOUND CORROSION ON DIAGONAL SUPPORT BEAM BOTTOM SIDE AROUND FASTENER HOLES FROM BS 1006 TO BS 1016, RBL 6. MAINTENANCE BLENDED OUT CORROSION AT BS 1006 TO BS 1016, RBL 6 AND FOUND REMAINING MATERIAL TO BE OUT OF LIMITS. REMOVED AND REPLACED FLOOR SUPPORT BEAM AT BS 1006 TO BS 1016, RBL 6 IAW BOEING 737-300 SRM 51-40-02.