As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING REMOVAL OF CENTRE SECONDARY FLAP DRIVE FLEX SHAFT, FOUND CHAFING DAMAGE TO THE TOP EXTERNAL SURFACE OF BOTH AFT STRINGER #3 BATHTUB FITTINGS (WING TO FUSELAGE), AFT OF REAR SPAR. THE DAMAGE WAS BLENDED OUT AS PER TEMPORARY REPAIR RD.