Hello, I have a very annoying occasionally flickering Mute button illumination. It will do a while and then stop for a while. I called McIntosh and they are not very helpful other than sending it to them which will cost at least $100 to mail to them and then a bunch for them to repair. I just got back another component back from repair and it cost like $400 to repair and all that happen was the internal battery went dead and the memory got erased so they had to reinstall the operating system. My question is 2 part. Can the LED be replaced on the board and what are the chances that it is just a bad LED?