Grand Master Funk kdog calls the dance steps on this little ditty:
You should replace the pair, you need to order 2
unscrew the 2 flange brackets securing the d/w to cabinet, remove the toe kick and slide the d/w out a way - you'll see the springs/hinges on the side, pretty self explanatory when you see them. Hopefully the water line is flexible enough to allow it to slide out a bit. If it is plumbed to steel or copper line and is fixed, unscrew the valve from the frame so that it can stay put. DO NOT disconnect water line as you could be asking for trouble. If your hands are nimble enough, you might be able to install them from underneath by removing only the toekick.
Part link to the door springs ==> http://www.repairclinic.com/PartDetail/Door-Spring/154430501/1014399?modelNumber=FDB989GFC2