Mute circuit on sonic frontier line one

[caoauto]

Hi all, I have sonic frontier line one tube preamp with black front face. Some how the mute circuit has some wrong in it. After warm up the circuit still mutting. I would like to know where can I buy the circuit diagram? or any one can give me the drawing of this relay circuit? or any one know where can I have it fit in Minneapolis area?. Thanks all in advance.

 

[dshortt9]

The information and repair is available through Parts Connexion.

http://www.partsconnexion.com/Index/SF_repairs-mods.html

I think Chris Johnson is the contact.