I would call Disney directly, whoever you made your original reservations through. If it was CRO then call them. Give them whatever requests you have. But, be sure to put them in order of priority. Don't just give them a laundry list. I tend to ask for....non-smoking, higher level (top if possible) area I would like to be in. This way, they can tell what it is you want, rather than you saying I want room 1234 in Magnolia Terrace, facing the river. Way too limiting.
I have had very good luck with POR giving me pretty much what I need. In fact, in June I had made only a request for AB, non-smoking. And that is what they gave me but a bldg way in the back. When I said that they must have known I was coming and saved the farthest building for me, the CM said she could put me in bldg 14 if I didn't mind waiting a few hours. Perfect spot. So, give them a chance to give you what you need. THen once you have called CRO and given them your 'requests' you can fine tune them upon check-in if there is anything available that suits you better.
Have fun....POR is one of our favorite resorts.