[Premium-Rx] JRC Repair?

[Ka9p at aol.com]

Happy New Year.
 
I've got a NRD-515 that apparently has a synthesizer issue, as the internal 
 CD16 LED is lit, indicating a problem with one of three main board  
synthesizer loops.
 
I've snooped around a bit and the correct signals seem to be there, but for 
 some reason the radio thinks not, and sends itself into mute.
 
Can anyone recommend someone that works on these receivers?  I've  talked 
to JRC, Sherwood and Universal, with no joy.
 
Thanks, Scott