While on the road I noticed what looked like a part of my roof fly off. Upon closer inspection, (after retrieving the piece), I found it to be a 8 1/4 X 5 3/4 inch piece of fiberglass (?). It is black on one side and beige on the other. I went onto the roof and found that it had been attached with Dicor (?) and located directly in front of the first air conditioner. I saw no holes or anything that required a patch. Any ideas? Was it to mark a wire location?