The Power Supply is integral to the ZD3000 and not separately replaceable. The entire ZD3000 should be covered by the Ruckus Limited Lifetime warranty. Please open an RMA support case with Ruckus support to verify your products warranty status. https://support.ruckuswireless.com/tools/warranty_checkerhttps://support.ruckuswireless.com/cases/new
External Power Supplies provided with Access Points and ZD1200 are only covered by a one year warranty. You should be able to order these power supplies from your authorized Ruckus Sales organization.
I hope this information is helpful,
Thanks for choosing Ruckus Networks Products.