Yes. However, they are usually limited to the one or two day park pass.
You only receive the discount on a full price ticket. Already discounted tickets are exempt. So, most of the time, you are better off purchasing one of the specials they are running such as the 7 day ticket for $85.00 that is currently being offered.
Occasionally they will have a special for AP holders such as buying the 1 day/ 2 park pass for 1/2 price.