Coat pan with pan spray. Place duck legs into pan. Place remaining ingredients into pan and toss to coat. Cover with foil. Place into a preheated 425 degree oven for 2 1/2 – 3 hours. Check for doneness after 2 hours. While cooking, add additional pineapple juice and/or soy sauce as needed to keep at least 1/4 inch of liquid in the pan. Continue to check legs every 20 minutes, removing those that are done. When done, meat should pull easily off of the bone. Allow to cool for 5 minutes before serving.