To make something clear: This forum is not led by the company Fairphone, but by its community, so it is unlikely to get an official answer (the Fairphone support team seldomly passes by).
Here is a report by @humorkritik, who got his display replaced under warranty:
Also this might help:
My suggestion: Contact Fairphone Support (on the bottom there is a button saying “Send a question”) and wait for a reply. Please let us know, which solution has been found.