Clean the case, glue down the lifting leather as evenly possible, then try to fill in the gaps using a leather repair kit like this: https://www.amazon.com/Coconix-Vinyl-Leather-Repair-Kit/dp/B07JC7SFNS. I managed acceptable results on a restore job for a VV 2-55using this method. The key is to try to March the original leather’s color and texture (using the correct backing fabric in the kit) as closely as possible. And, if you really want to go all our, you can’t use a color leather polish for the entire case when you’re done.