[Elecraft] K3 TX calibration fails after KXV3B and SYN3A upgrade

[Dave G3WGN M6O]

I'm hoping there is a quick fix for this (some fat-fingering or brain fade on
my part is entirely possible) as the K3 in question is one of four heading
to E6GG next month. 
Yesterday I upgraded S/N 4474 with KXV3B and 2 x SYN3As and while the panels
were off, also did the 12V DC Out mod and gold connector replacement mod.  I
have a full ESD bench and wore a wrist strap at all times.  
After careful reassembly and TMP cable checks, I was able to update to
latest firmware and enable synths and KXV3B.  But TX Calibration failed with
Calibration power settled at "   0W; " message.
I have tried the following remedies:
Panels off and examined all boards for correct seating.
Examined all TMP cables for correct seating.
Replaced panels.
Re-attempted Calibration - same error.
Re-flashed the firmware load.  Load successful.
Re-attempted Calibration - same error.
Performed EE INIT
Loaded a known-good prior configuration (from March 2015 well before the
upgrade)
Re-attempted Calibration - same error.

Any suggestions for next steps gratefully received!
73
David G3WGN WJ6O



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