FIREPLACE DIAGNOSTIC: The flue cap/ spark arrester is kick and appears to be falling off. I came up and found that the cap assembly is totally fine but the issue is that the actual flue pipe is round and the cap assembly is made for square flues. I was able to retighten the cap into place and as well put some sealant on it to attempt to keep it in place. Due to the assembly being for square chimneys not round, we are not able to guarantee our work for today as well as it would depend on snow loads. If the issue is to occur again I would suggest getting a roofing company involved to get the proper cap assembly for the chimney.