My Enviro Meridian has been blowing what appears to be pellet dust/granules from the small gap between the back of the fire box and the front flange of the hopper. I did a complete yearly cleaning recommended in the manual. The granules are then blown by the heat exchanger tubes approx. 4 feet out from the stove. I live on an island which makes it a bit more difficult and expensive to arrange for a service call. Any help/advice would be greatly appreciated. Thank you.