R7000 LED meaning

I currently have an R7000 Nighthawk router. I recently had my local cable company out to update they're modem and the tech mentioned that I had a poor Ethernet connection because of one of the LED's on my router was orange and not white. I'm writing to ask anyone with a lot more knowledge then me when it comes to routers if anyone knows what this LED represents as this was the LED he was talking about.

Any help would be appreciated.

Thanks to all