Sorry Lambert. Yes, I do customs as a hobby but haven't had any decals fall off so I don't really have a remedy. As I pondered how to fix yours, the nail gun came to mind, obviously not as a serious idea. But I ran with it. That was the thought process. I got that image of the boutonniere lodged in my mind, and being of weak character, couldn't resist. Probably should have posted the boutonniere video first but when I saw the M-16 nail gun it was all over.
My advice is to recreate the decals and apply them as new. Everything you need to know to do this is here... http://www.customsbyjomo.com/tips.html
Decal tips are at the bottom of the page.