I have had three fords all repaired under the paintwork warranty and one of them was five years old, my RS had a new A pillar, my 54 plate fiesta ghia had the door seams repaired and the same with my dads mondeo ghia x, all i had to show was the cars service history and paintwork stamps.
Get in touch with ford customer service, if you leave it, its only going to cost more to repair in the longterm. They will try and fob you off so keep at them.