[Elecraft] K2 - Need tips on troubleshooting audio intermittent problem

[dw]

Hi Gang,
I got my K2 a couple of years ago.
Once in a great while I would notice the audio volume drop to about 30%.
It would typically happen after I had moved the unit or had the cover
off doing filter alignments.
I found I would simply tap the unit and the audio volume would be
normal.

I figured I would eventually get around to checking the circuit when I
had the unit cover off again.

Well last week I replaced the audio and RF gain pots.
Those are working sweetly.

At the time I had the control PC dis-assembled I did some re-soldering
of all of the joints I could find around the LM380.

I thought I had it fixed by doing that but last night it did it again.

Any hints or tips on best way to troubleshoot this?

Maybe tracing the audio circuit with a signal source at the time it
drops?
Your suggestions welcome!!

Thanks
N1BBR
-- 
 Bw_dw at fastmail.net