@Bobby1859 Since they were adopted by the dead controller, I suspect that a n AP reset is the only choice. It's really not a big deal though... reset one and get it working the way that you want it too... then adopt the rest and they will pretty much automatically all get configured.

@rickk1000 I discovered an alternative to resetting the EAPs.

After I installed the replacement OC200, within Omada controller, the EAPs were shown, and the status of each was Managed By Others.  This was not surprising. But, the blue Adopt button was available.  I clicked that and it asked for a user Id and password.  I tried using the local access UID and password for the old, failed OC200. It worked.  So I was able to re-adopt my EAPs without climbing ladders all over the building to reset them.  

@Bobby1859

Had a similar experience and was able to find the EAPs IP addresses from the router.  Then tried to log into the EAP from a browser and got a message that the device was being managed by another device, but it also gave an option to reset the EAP.  After selecting the reset button it was available to adopt in to the new controller.  Uploaded the controller backup and all settings were restored.