[Elecraft] K3 missing right channel in front phones

[Fred KE7FB]

I have been using the phones on my K3 for several weeks now.  Yesterday I
plugged my Yamaha CM500 into the rear stereo and mic connections for the
first time. Testing only the phones, everything worked properly. This
morning I return the phones (using the proper adapter) to the front phones
plug to find the right ear is dead.  I have checked to see that the CONFIG
SPKR+PH is no and SPKRS=1.  

Fred