I fired up my P-43 this morning and noticed the 4 x 9 x 1 inch fire brick above the flame guide guide was missing. The only thing I can figure out is it must have become lose and fell into the ash pan. I empied the ash pan into a metal trash can and disposed of the ash. The two questions I have are: 1. Do you believe it will harm the stove if I continue to run it on low settings (1-2 on stove temp)? 2. How is the fire brick attached to the back wall of the stove? I see no holes for screws or any clips, etc? Is it glued on? Thanks in advance for your responses!