Peel back the fiberglass???? Have you ever worked with fiberglass??? Fiberglass is rigid, as a general rule it does not bend easy, or at all. It will break before it bends. You may be able to pull it off the wood a 1/8" or so. But unless you break it. You will not move it far enough to get resin behind it with out the proper tools, and even if you could, how are you going to hold it together while the resin dries.? It will prolly have to be cut off past where it has turned loose, reglassed, and gel coated. Then sanded smooth, and buffed out. Will take a while to do it right.
Another option is to replace the entire panel.
Were I you. I would let the pros do it. It is a pretty major undertaking.