Jiggs, although I have not personally done what you are about to do, there are past threads explaining the process. Basically you should reglue the sagging ensilite, thoroughly clean it, use a paintable latex calk to fill in the seams. You dampen a rag or paper towel wadded up to gently dab at the calk prior to it fully drying to try to match the texture of the elephant hide.
Paint with a good latex
paint. If you don’t want to go this route, you can still purchase new seam tape.
Keep us posted and take pictures of the entire process.
Good luck.
Dave&Paula