[Elecraft] K3 :: digital display of RF input level

[Milt, N5IA]

My K-3 has been working FB since it was birthed from a cardboard box.

However, when recently moving at a few miles from its normal crib to a 
portable contest location a problem showed up.

At the contest site my baby will not make power once the power set control 
is advanced to the level where the PA is supposed to kick in.  This is all 
bands and all modes.  Everything appears normal without the PA selected.

I have tried the common external things like resetting, etc., to no avail. 
There are no error messages and I find no clues in the troubleshooting 
section of the manual.

Before digging into it and looking for what I believe might be a physical 
thing (loose connection/connector, etc.) does anyone have any history of 
this problem occurring previously.  Why reinvent the wheel?

Any ideas anyone?

Milt, N5IA