As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) LEFT AND RIGHT KEEL BEAM WEBS CORRODED IN THE AREA JUST FORWARD OF STN 727A. FURTHER INVESTIGATION FOUND THE CORROSION RAN UNDER THE SEALANT BETWEEN THE KEEL BEAM LOWER CHORDS AND THE FUSELAGE SKIN. FOUND DURING INSPECTION IAW ER B73-53-20-5.