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They are assigned via DHCP (I looked at fixed IP but it's one of those areas where googling the settings only gets you solutions to far more complicated problems).
The APs work fine, are still adopted and I can see everything that is connected to them in the client devices. It's just that the topology screen no longer shows a nice map with the APs and what is connected to each.
Did you have an assigned IP for the APs, or DHCP? Can you see them on the network at all?
My usual approach is to SSH to them, unadopt them via the command line, them adopt them again in the controller.