[Elecraft] K3 audio 1 channel only?

[David F. Reed]

My K3 has developed a problem... (used to work fine in this regard).

When I plug external speakers (stereo) into the speaker out jack on the 
rear panel, I only get left channel audio.
When I plug them instead into the rear headphone jack, I get both channels.

This leads me to suspect that the audio amplifier has a right channel 
problem, or there is an issue with the jack.

Any ideas on how difficult it is to fix, and what is involved?

Thanks and 73 de Dave, W5SV