As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK IN CVG, FLOORBEAM 18 BETWEEN NR 3 AND 4 SEAT TRACK AND OUTBOARD 1.0 INCH FROM NR 4 SEAT TRACK HAS CORROSION ON UPPER SURFACE BEYOND LIMITS. MAINTENANCE REPAIRED FLOORBEAM 18 IAW EO A53013 AND BAE FAX BARA/AVR/6171/02-DC.