Well, i took my scanner apart for a sec to see how easy it would be to get to the led's and there is a metal strand preventing the face to come apart from the circuit board. It looks like the metal that is wrapped around these exhaust connector. Do you know if that goes to something important?
It's totally possible. I did it with the 396T uniden but you need desoldering tools, desolder braid or pump at a minimum and heat gun is best plus a variable temp iron. I've never looked into doing the GREs since I actually like the bright yellow.