[Elecraft] K3 external speaker output dead

[ac5p at sbcglobal.net]

I recently purchased 2 replacement K3 speakers to make tuned port enclosures for CW audio.  
Plugging one of the speakers to the rear panel jack (via 3.5mm stereo plug) to test resulted in no output. 
Had the config SPKRS = 1   Rear jack worked fine last time I tried an external speaker.   Full audio 
output is fine on the internal speaker.   Anyone reading had this issue?  Any ideas?
 
73,
Mike AC5P