What was found
ON FINAL APPROACH WIRES UNDER SEAT 25B SPARKED ELECTRICAL SMOKE. HALON FIRE EXTINGUISHER USED. CAUSE OF ELECTRICAL SPARK WAS IDENTIFIED TO ORIGINATE FROM THE SEAT-TO-SEAT CABLE, WHICH CONNECTS BOTH PES AND PSS DATA. THIS CABLE ALSO CARRIES 110 VAC. PER AIRCRAFT SAFETY, A CUSTOMER (ESCORTED IN PROTECTIVE CUSTODY) WAS KICKING THE SEAT IN FRONT OF HIM, CONTACTING THE SEAT-TO-SEAT CABLE RESULTING IN THIS INCIDENT. REPLACED THE SEAT-TO-SEAT CABLE AND PERFORM AN OPERATIONAL CHECK.