Technically yes it’s a two year warranty.
One issue that can void it is dampness, which may be detected if you sent it off for an offcial repair.
It is always a good idea to contact fairphone offcially you ca use thier form or email tp support@fairphone.com
Eihter way you should get a ticket number within 24 hours or so, excluding weekends, but it can take a couple of weeks to get any usefull info back.
If you email, please send proof of purchase and a lot of detail.
You can remove the screen to see if there is any indication of water ingress though the red square is by no means definitive. Corrosion of contacts between the modules can be harder to see.
If you are in hurry, why wouldn’t you be, 
you can call and ask if they accept that you are going to open the phone to see if there is water damage by checking the indicator, if there is then the warranty is void and you can dismantle to your will.