[Elecraft] K3 SSB audio got lost

[Tommy]

Now I am in real trouble!!

This morning when I turned on my K3, in hopes of being able to perform some
positive troubleshooting on my lost USB and LSB rcvr audio, I went to the
20m SSB band and lo and behold my USB rcvr audio is NOW WORKING!! 
I have done nothing to my K3 except for having gone over the menu
configurations numerous times, so I don't know what caused the problem nor
what fixed it. A worrisome result - but it's now working!

Many thanks to all who offered helpful suggestions.they were all greatly
appreciated.

73,
Tom - W4BQF