As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE VERTICAL STABILIZER MID SPAR CHORD AT FIN STATION 215 ON THE LEFT SIDE WAS FOUND CHAFED TO BELOW THE MINIMUM ALLOWABLE THICKNESS OF THE CHORD. THE DAMAGED AREA WAS BLENDED OUT AND A REINFORCING REPAIR ANGLE WAS INSTALLED PER TIMCO REPAIR INSTRUCTIONS. THIS REPAIR WAS APPROVED BY BOEING'S DER WITH AN 8110-3.