As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE MAINTENANCE, BOTH FLAP LEADING EDGE SKINS WERE FOUND CRACKED. CRACKS WERE AROUND THE RIVET HOLES WERE P/N 0523923 26, ATTACHES TO FLAPS ON THE BOTTOM SIDE. CRACKS WERE .25 INCH - .50 INCH IN LENGTH, AND ALMOST EVERY RIVET HOLE WAS AFFECTED. SUBMITTER STATED POSSIBLE CAUSE WAS IMPROPER DEBURRING ON THE FACTORY'S PART. ALL FLAP RIVETS SHOULD BE CHECKED CAREFULLY DURING PRE-FLIGHTS AND ROUTING MAINTENANCE.