My back plate on the inside of the stove seems to be warped, as well as cracked... Can I braze the crack? Second question, the warpage seems to have a deflection of 3/8" at the bottom on the right side of the crack, the crack is about 1/4"-1/2" long comming up from the bottom. Third... The deflection at the top where the main flu "flap" , at the bottom where the 'hinge' goes through, is 3/4" wide in the middle and 1/2" on bothe ends. Pictures of the top down with the lid open would be appreciated.