What was found
SMOKE APPEARED IN THE AIRCRAFT CABIN NEAR THE VICINITY OF SEATS 37 AND 38KL WHILE ON FINAL APPROACH TO DUS. THE FLIGHT ATTENDANT'S PULLED OVERHEAD PANEL IN THE AREA AND USED HALON TO COOL THE AREA. NO FIRE WAS OBSERVED. THE AIRCRAFT LANDED AT DUS WITHOUT INCIDENT. THE FAULT WAS TRACED TO OVERHEATED TIMER/DECODER ABOVE SEATS 37 AND 38KL. THE TIMER/DECODER WAS REMOVED AND REPLACED. NO WIRING DAMAGE WAS FOUND. IN ADDITION, THE HALON FIRE EXTINGUISHER WAS REPLACED.