[Elecraft] No Audio, Main RX, Right Ear

[jmaass at k8nd.com]

    We have a new-to-us K3 at the PJ2T station (#00157). It has had some upgrades done on it in the

 When I went to use it this afternoon, I noticed that there was no audio (or, extremely low audio) in the right ear of my headphones. I thought it was perhaps the phone jack, but when I enaabled the subreceiver, its audio was presented to my right ear as expected, and the Main receiver audio remained in my left ear. 

 Is there a configuration item that might explain this condition? Something else I should check?

 73,  Jeff  PJ2/K8ND