I have a 37" heat form fireplace that we put in our house when we built it in 1987. We had never had it cleaned or inspected until yesterday and there are rusted holes in the tubes and on the front. Can we repair the holes and put in a wood burning stove without having to tear everything out? The entire wall is brick and the hearth is around 17 inches out from the fireplace and 14 1/2 inches tall. It has flues in the chimney that has cracks that we were going to let them put heatshield in and then they found this issue. We don't get to use our fireplace much because we don't normally have weather for it, but love it when we do and would like to keep it if possible. The hole is covered for the summer.