The fireplace works great with the doors open. But when I close the doors the draft control on the bottom doesn't seem to let enough air in. It feels loose and not connected to anything when I move it back and forth. However if I go outside to the combustion air inlet I can hear the combustion air coming in. The draft control knob doens't really change the flame either so it's like it is disconected. Can anyone tell me how to get to it to check it? I don't think the fireplace would come out w/o some demo of the surrounding rock fascia. Is there an access panel inside somewhere? The lever seems to bend 90 degrees straight up and goes back into the fireplace but I can't find any drawings to show me what it looks like.