[Elecraft] KX3 Transmit Calibration Issue??

[Ken]

Hello again all,
in an effort to find out why the ATU reports this 24:1 SWR thing on batteries, I did the automatic xmit calibration from the Utility program and got.......
The first round was set at 4 watts, as it says, the second 6 watts.
>Power supply during transmit was 13.8V with 4 amps available?<
 
"OS Version 10.0 Build 19045 
KX3 MCU version 03.02 on COM5 at 19200 bit/s
Calibrating at 1.900 MHz
Elapsed time: 12 seconds
TX Gain calibration failed because transmit power did not reach the expected value
5 watt calibration failed
Elapsed time: 12 seconds"
 
Then I did it using the manual method and got......
d-084 Err TXG on 160M.
d-085 Err TNG on 10M
 
The power knob takes it to 15 watts, per a firmware upgrade a long time ago, but it only puts out a maximum of 10 watts into a dummy load??
 
Any info appreciated.
Ken, W2GIW