As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FORWARD LEFT SIDE OF THE KEEL BEAM CAP (PN: L533M1009203) AT FUSELAGE STATION 2,670MM AND 2,440MM WERE FOUND TO HAVE CORROSION DAMAGE BENEATH THE EDGE OF THE COCKPIT FLOOR. THE DAMAGE WAS LOCALIZED AROUND A NUT PLATE AT EACH LOCATION. THE FORWARD CORROSION DAMAGE TOTAL AREA MEASURED APPROXIMATELY 1” X 0.75” X 0.16” DEEP. THE AFT CORROSION DAMAGE WAS APPROXIMATELY 0.25” X 0.25” X 0.11” DEEP.