As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK, CORROSION WAS FOUND AROUND NUTPLATES ON THE UNDERSIDE OF THE CENTER OMEGA BEAM FLOOR SUPPORT AT FRAMES 20 AND 23. MAINTENANCE INSTALLED A NEW OMEGA BEAM IAW SRM 51-40-02. ALL WORK ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.