[Elecraft] VFO B receive not heard in headphones with SUB on

[Jeff Hall, W6UX]

I haven't used my K3 much since Field Day.  Today I turned it on and engaged the sub receiver by tapping SUB.  Instead of hearing VFO B in my right ear, I only hear VFO A in my left ear.

Adjusting the SUB RF control affects VFO A volume.  It's like the radio's sub receiver configuration got messed up, or maybe one of the internal coax cables maybe came loose?  Or I guess I just forgot how to use the sub receiver!

Can someone please provide me with the troubleshooting procedures?

Thanks!
Jeff, W6UX

Sent from my iPad