[Elecraft] K4D issue with internal speaker

[n0tt1 at juno.com]

Guys, I have a new K4D that doesn't mute the internal
speaker when headphones are plugged into the front
panel.  According to the manual, that should happen.

The Menu settings for the speaker/phones are:
Speaker, Internal = ON
Speakers + Phones  = NO
Speakers, External = 1
    (there are no external speakers plugged in.)

Thanks, 
Charlie, N0TT