Airport extreme not detecting ethernet from modem

Hello everyone,
I'm hoping someone can help me out with this because I give up on trying.
I have a 5th generation Airport Extreme hooked up to a Ubee D3.0 cable modem and I use it for my home's wifi. Recently, the AE stopped working (blinking amber light) and airport utility says the WAN ethernet cable was not plugged in (although it was). I've tried resetting everything multiple times, tried a new ethernet cable, etc. I was fairly sure it was a problem with the AE because I can plug my laptop directly into my cable modem and get a wired connection.
So, I took the AE into Apple and they gave me a new one. No luck though--still having the same problem. Basically, when I plug the ethernet from my modem into the Airport Extreme, the green light in the ethernet port doesn't light up and no connection is detected.
What is even weirder is that I tried hooking up the same Airport Extreme to a different modem and it worked perfectly--no problems establishing a connection.
So I can get a direct wired connection from my Ubee modem to my laptop, which shows the modem is working.
And, the AE works with another modem, which seems to show the AE is working also.
But when I use the Ubee modem and the AE together--nothing. HELP! Thanks

Based on your description, the WAN port is damaged and in need of repair.  A shop will need to check to see how far the voltage surge got into the device. I am not certain whether Apple offers repairs on the AirPort Extreme or not. You might want to check with an Apple store on that and have them check the device as well.

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