Ok i was bored so i poped up my caps lock key from the front.... it appears to be an led, but you would have to open the comp all up to remove it, i sugest just pulling the key up, (FROM THE FRONT, APPERENTLY APPLE THOUGHT PPL WOULD WANT TO OPEN THE CAPS LOCK KEY< SO THEY MADE IT TO OPEN FROM THE FRONT...) and put a small peice of tape over the little thing with the marker cercle over it. then close. like i said get a small peice of gaffers tape... and press the button down hard after repair... enjoy.

-Knife