I think you'll need a photo for us to understand. It sounds like you're talking about the filon above the chassis cab. I don't think you have a one piece front cap, but sidewall material "Filon" curved around the front frame.
This also sounds like you have a major delamination happening there. Which is usually caused by water intrusion. Not good.
You can upload an image as an attachment.
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- Click "Upload" After pics have loaded close the pop-up window
- Click "submit reply" to mount the text of your message - photos will automatically appear at the bottom of your post.