[Elecraft] K3 SN 3006 can't find any setting to mute the built in speaker

[Jerome S]

Hello all just loving the new K3,  All is well except one thing.   I 
don't seem to have any way to mute the built in speaker.   When I plug 
in phones either in the front or rear the speaker does not mute.   I 
have set the SPKR+PH to  "no"  and SPKRS to "2" 

  I did try FW 3.14 and a reload of the other firmware.

 I have a K3/100 with ATU and one optional filter 400hz.   That is it.  
Like I said everything else working fine just this one issue. 

  73s de Jerome K8LF