Audio Refinement Complete-Blue LED at front ?

I have had this amp for almost six months. I recently upgraded my Rotel RCD-1072 to a Naim CD5i. There seems to be some frequency interference with the remote frequencies with the Naim remote having some minor effect on the AR amp and vice versa - nothing too annoying though.

However, when I push the STOP button on the Naim remote I hear a relay sound come from the AR amp and a blue LED light turns on which illuminates the front-center foot of the AR from under the amp. When I push it again, it turns off.

I didn't know there was a blue light there until now and nothing in the AR manual or online has mentioned it. Nothing on the YBA remote seems to turn it on or off - just my STOP button on the Naim remote. What is it for (just decoration), does it signal anything else happening (it's a heck of a relay sound to turn a light on and off...), any negative effect to having it on or the fact that I switch it on and off quite a bit with the use of the Naim remote?

Does anyone know anything about this?

By the way - great amp + great CD player with my Quad 21Ls and Kimber Timbre interconnects. Signal Cable power cables and speaker cables.

Thanks

Jeff