As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE O/B HORIZONTAL FLANGE OF THE STRINGER 29R KEEL CHORD WAS FOUND CORRODED BETWEEN FS 950D AND 950E. THE CORROSION WAS REMOVED BY BLENDING AWAY THE DAMAGED MATERIAL. THE CHORD WAS REPAIRED WITH THE INSTALLATION OF AN ALUMINUM REPAIR STRAP PER ER/A 377147-14.