[Elecraft] K3 no power

[Mike Reublin NF4L]

My K3 puts out no power in any mode, either on the SteppIR or into a dummy load. It's not in test or split. TX INH is off. Holding tune results in the LCD displaying 0 W, and the VFO A area changes to 2 dashes on the right, no digits. Tune power is set to 50W, Power to 100W.

A 50W TX Gain calibration passed, but still no joy.   

It seems to be hearing OK.

What have I fat fingered?

73, Mike NF4L