[Elecraft] K3 utility - RestorePower: Unexpected response 'PC008; ' to 'PC; '. State 87

[Shane]

I'm doing the calibration step in the "TX Gain Calibration" section. I
hook my mac up to the K3 via the serial to USB cable, attach the dummy
load, run the K3 utility (Calibration->Calibrate Transmitter Gain),
and get the following results.

---
Starting 5 watt calibration.
Calibrating at 1.900 MHz
Calibrating at 3.750 MHz
Calibrating at 5.366 MHz
Calibrating at 7.150 MHz
Calibrating at 10.125 MHz
Calibrating at 14.200 MHz
Calibrating at 18.110 MHz
Calibrating at 21.200 MHz
Calibrating at 24.930 MHz
Calibrating at 29.000 MHz
Calibrating at 52.000 MHz
RestorePower: Unexpected response 'PC008;' to 'PC;'. State 87. Retrying
RestorePower: Unexpected response 'PC008;' to 'PC;'. State 87. Retrying
RestorePower: Unexpected response 'PC008;' to 'PC;'. State 87. Retrying
RestorePower: Unexpected response 'PC008;' to 'PC;'. State 87. Retrying
RestorePower: Unexpected response 'PC008;' to 'PC;'. State 87. Retrying
RestorePower: Unexpected response 'PC008;' to 'PC;'. State 87
5 watt calibration failed.
Elapsed time: 47.5 secs
---

So I'm trying to confirm what the TX mode is, as I see this note in
the K3 utility help.

"Transmitter Gain Calibration requires that the K3 be in TX NORMal,
not TX TEST mode."

Anyone know where this TX mode of normal and test is?