Cisco 1131AG LWAP status led yellow and other leds blinking green

I have a problem with three AIR-LAP1131AG-E-K9 that joined the controller and the status led turns to yellow after joining the controller while other LEDs are blinking green.
The APs has no coverage at all although the WCS shows that there is coverage and the 4400WLC shows that the AP interfaces are UP. (The ethernet interface and tha 802.11b,g radio interface is up).
The SSID broadcast is enabled.
On the switch the interface is up and there is traffic going in and out of the LAP.
I tired power reset and factory reset for the APs but the problem remains the same.
Any ideas for what might be the problem ?!!
Regards

Yes the clients are not able to see the SSID broadcasted by the AP.
But these APs were functioning normally before without any changes to the WLC config.
I had the same problem with other APs but they went back to normal state after a hardware reset to the APs.

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Duplicate posts.
Go here: http://supportforums.cisco.com/discussion/12154826/problem-cisco-air-lap1131ag-e-k9-ethernet-led-radio-led-red-status-led-red

Cisco 1131AG LWAP status led yellow and other leds blinking green

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