H100i Mounting bracket issues

I have an h100i where one of my mounting screws broke off into the back plate. I cannot remount the cooler untill i get a replacement, does anyone know where i can purchase a replacement backplate/4screws? Will my Warrenty cover this as well? i purchased the cooler late august. i have a haswell processor (i-5). My ticket number is 6469980



Thanks for the help :D