[Elecraft] Lost K2 Sidetone

[Jeff]

I have somehow lost my K2's sidetone in CW mode.  I checked the sidetone level and pitch, and they are set properly, according to the display, but I don't hear a tone as I adjust them.  The spotting tone also does not work.  The internal keyer works fine, as far as keying the transmitter.  I haven't opened up the rig recently.  All I've done is play with menu settings.  Am I overlooking a menu option that disables the sidetone?  I'm definitely in CW mode, not SSB, so the sidetone should be working.

Any suggestions on where to look for the problem?

Thanks very much & 73,
Jeff
WB5GWB
Long Island, NY