This only happens when self healing has been applied.
And remember that self Healing modifies only the power setting, and not the channel frequency or beacon interval of the neighboring APs.
The indicated radio appeared up or down on this AP, so other radios were modified to maintain coverage.
After self healing has been applied to the other AP, this fault indicates the radio that had the failure.
If self healing is configured to automatically apply changes, then these are the values that were applied. You can select the document with the eyeglasses in the faults page of that particular fault. A list of radios with the old and new power settings is displayed. These radios can compensate for the downed or recovered radio.
Check out this doc for more info: http://www.cisco.com/en/US/products/sw/cscowork/ps3915/products_user_guide_chapter09186a008052dba5.html
