I would call 1-800-wdisney and see if you can get a AAA rate for your room for your existing reservation.
AP is an annual pass -- discounts that are offered to Annual Pass holders usually excede the discount for AAA.
Also, I've heard of discounts sometimes offered for Florida residents and discounts given somewhat randomly via mail or email.
Currently, there are a lot of people on this board waiting to see if any discounts will be available this summer for Annual Pass holders.
Good Luck on your trip!
EthansMom