I've had to upgrade and then downgrade firmware on one of my 651 controllers recently. I'm currently running 6.1.3.12, a known good release. My problem is that the internal access point has 'dropped off the network' and shows as DOWN in the ap database. It does not appear in the list of APs under the gui, so I'm having trouble re-provisioning it. How do I rediscover my internal AP on the 651 so that I can re-provision it?