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As per the case description, I could understand that one of your Access Points is not working and it has a Red PWR light.
Apologies we cannot replace the Access Point until it’s a hardware issue.
To confirm the same, please try to unplug and plug the ethernet cable of the affected Access point from the Switch panel. You could plug it in different ports on the Switch panel within 12 ports as shown in the below screenshot. And check the behavior.
If still you have the same issue, you could check with another ethernet cable, in case if the currently connected cable to the affected Access Point is damaged.
Please share a picture of the Switch showing the light status and cable connections and the pictures of all the Access Points showing the light status, including working APs. (Please refer to the below picture)
Please help us with pictures of your ICX-7150-C12P Switch showing the status of the lights and cable connections. Also, light the status of Access Points.
Before uploading the photos, please log in to the RUCKUS account and you can upload the image.
Please let us know the answers to the above queries or if you have any queries in this regard.