@gavinhollis that type of discoloration is commonly caused by the backlight strips themselves. The only way to eliminate that, would be by replacing the backlight strips. Check something like this video to work on it. It's not quite the same model but should work for yours as well. You will see the strip at around 8:10min.
While you work on your monitor, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0