Try The Stereo Doctor in Dublin California. I have had him repair lots of stuff and he is always top notch. BTW, repair is all they do, this is not a retail outlet although he does have used gear for sale there.
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If your red led comes on after about 30 seconds you're good. Just open the top and re-solder wire(s) to the mute switch (mine is a Revelation II with balance control, but there's a pic of yours on Audiogon that looks to have the same setup.) If the led doesn't light there's probably something more complex going on with you system.