Ok, here goes ...
Autonomous IOS for the AP3500 can be found HERE. Why am I mentioning this? Find a version that is the "latest". Take note exact filename of the firmware as well as the web link to the file.
Next, read this Security Bulletin very carefully: Multiple Vulnerabilities in Wi-Fi Protected Access and Wi-Fi Protected Access II
Scroll down to the "Customers Without Service Contracts" section and read those two paragraphs very, very carefully.
IMPORTANT: DO NOT CALL TAC -- Send them an email.
So here's the deal: When dealing with TAC, the process flows faster if the Entitlements Team are provided with the filename of the firmware that needs to be published. The web link to the file would be beneficial.
Hope this helps.