What was found
UPON LANDING PILOT WAS INFORMED BY PASSENGER THAT TOUR STATION SEAT 6B HAD LOUD POPPING AND SMOKE WAS OBSERVED. MAINTENANCE INSPECTED AND FOUND NO SMOKE BUT ITEM DID SMELL HOT. TOUR STATION REPLACED. INSPECTED REMOVED TOUR STATION AND FOUND VOLUME CONTROL SWITCH LOOSE AND SHORTED AGAINST METAL REINFORCING PLATE. SOME HOW PASSENGER LOOSENED SWITCH ENOUGH FOR SWITCH TO BACK OUT ENOUGH TO BYPASS THE ANTI-ROTATION PIN AND CONNECTORS TO TOUCH THE METAL BACKING PLATE.