As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING SLAT CABLE RUBBING INTO PULLEY BRACKET JUST OUTBOARD OF THE DRIVE ASSEMBLY BEHIND THE NR 3 & 4 SLAT SPLIT. OCCURRED DUE TO THE CABLE NOT RIDING INSIDE OF PULLEY TRACK. THE PULLEY GUIDE PIN WAS FOUND DANGLING UNSECURE AT THE BRACKET. REPLACED NEW AND RIGGED IAW MM.