As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED MX, THE KEEL BEAM STRINGER 31R WAS FOUND TO HAVE EXTENSIVE CORROSION AT APPROX X247. AFTER CUTTING OUT THE DAMAGE, THE DISCREPANT AREA REMOVED MEASURES 6" IN LENGTH. THE STRINGER IS MADE FROM 7075-T6511 ALUMINUM, EXTRUSION CV607.