THERE WAS A FIRE IN THE ELECTRICAL CABLE TRAY LOCATED ON THE BURNER FLOOR. AN ISOLATION VALVE LOCATED ABOVE THE CABLE TRAY LEAKED ALLOWING COAL DUST TO ACCUMULATE ON THE CABLE TRAY. IT IS BELIEVED THE COAL WAS IGNITED BY HIGH TEMPERATURE ON THE COOLER BAG HOUSE DUCT DURING A PUSH. THE FIRE WAS EXTINGISHED. LOCAL FIRE DEPARTMENT WAS NOT CALLED TO THE SCENE.