[Elecraft] KAT2 unresponsive

[Bob]

 After doing a re-alignment of my K2 ser. #3218 yesterday I started to play
on the air and suddenly my KAT2 would no longer tune to my buddipole
antenna.  In fact, the ATU menu is now inaccessible. When entering the menu
system and selecting the ATU submenu, the only display is "--" while
rotating the VFO or using Band+/Band- to change menu options.

I removed the KAT2 assembly and looked at all components but did not see
anything obviously smoked, so I'm at a loss of what might be wrong.  The
tuner was working fine yesterday and earlier today, and then after one
press of the "Tune" button on the front panel it is no longer functional.

Help appreciated!

Best regards,

Bob Solimeno  KC2JAV