Do your campus APS got their Default gateway correctly set?
If the Wireless controller and the AP are on the same subnet, the AP will communicate correctly to the Wireless controller, but noone on another vlan will see them...
And as he just need to terminate his tunnel to the controller he actually should not need the default gateways and it will work but well.. you should put the correct default gateway...
Can you check the default gateway that the AP has?
If it reciving it through the DHCP server, check on the DHCP server that the gateway is correctly set
If it was statically set, then check on AP installation what default gateway it has..
Cheers
Carlos