[Elecraft] ERR TXG No Power Output

[Jim McCook]

I have a spontaneous K3 failure after making no changes. This morning my 
K3 has only 1 or 2w power output when set to 100w or around 32w when the 
KPA1500 is turned on and set to OPER.  It's the same on all bands and 
with a dummy load.  It worked fine last night for several QSOs.  I tried 
a 5w TX GAIN calibration but it failed with erratic, varying low power 
readings.  I loaded a previous Configuration file but that didn't help.  
Whenever I press TUNE I get the ERR TXG message after shutting it off.  
Power in TUNE is set to 50w, but when I hold TUNE the display flickers 
between 2 and 8w.  Any ideas?  Jim W6YA