Just this morning notice a prominent crack in the firex insulator on the back of my Ravelli Francesca combustion chamber. it runs from one outer edge to the center of the pellet drop chute. Only on one side of the drop chute, not straight across the entire panel. This wasn't cracked when I cleaned the stove not too long ago. It looks fairly deep, possibly through the entire depth. I have read these are fragile and do develop cracks at times. Can this be repaired with a cement or adhesive. I looks kind of ugly once you know its there. Any input greatly appreciated. Jim