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-18 CHECK GALVANIC CORROSION WAS FOUND ON FLOOR SUPPORT AT BS 1011-1016, RBL 6. MAINTENANCE REMOVED CORRODED FLOOR SUPPORT FROM BS 1011 TO BS 1016, RBL 6; FABRICATED A NEW REPLACEMENT FLOOR SUPPORT PER DWG 65-46812; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG 12, PG 45.