Came home tonight and fired up my P43. Burn Pot overflowed and it appears I am missing some air into the stove. After some investigation, something doesn't look right. It is still cooling down, but where the pipe attaches to the back of the stove inside, looks loose. Also looks as though air is maybe coming in around pipe. I don't really know what is supposed to be here, or what the pipe is for, maybe air for the glass? Anyway, is there a gasket or something for this area? Thoughts please. Kent