2.- Another way is to generate a Service Report using the interface menu (Setup-> Device Information-> Service Report) .........
Beautiful!! Thank you!
I had seen the 'device information' menu item of course, but it did not seem interesting, so I just passed it by.
I wonder how much else there is about this scope that I don't know .

Just as a FYI, here are three excerpts (using my newfound knowledge) from the info utility. After one hour the temperatures are stable.
Four channels + sigGen active.
The ambient temperature is 26 C.
Note the fan speed! Ime fan speed is a very good indication of noise. As far as I can tell, the system never attempts to change the fan speed.
Operating time: 3 min
Temperature Sensors
1: CB-ADC0: 63.5 °C; Min 29.4; Max 63.5; Warning @ 95.0; Device Off @ 105.0
2: CB-FPGA: 55.0 °C; Min 22.0; Max 55.0; Warning @ 90.0; Device Off @ 100.0
3: CB-CPU: 42.5 °C; Min 24.1; Max 42.5; Warning @ 80.0; Device Off @ 90.0
4: CB-TMP432: 47.3 °C; Min 25.1; Max 47.3
Fan Speed = 91.8 %; Min 81.5; Max 91.8 (588 rpm; Min 452; Max 593)
Operating time: 1 h 1 min
Temperature Sensors
1: CB-ADC0: 69.2 °C; Min 29.4; Max 70.1; Warning @ 95.0; Device Off @ 105.0
2: CB-FPGA: 57.0 °C; Min 22.0; Max 63.0; Warning @ 90.0; Device Off @ 100.0
3: CB-CPU: 50.0 °C; Min 24.1; Max 50.9; Warning @ 80.0; Device Off @ 90.0
4: CB-TMP432: 52.9 °C; Min 25.1; Max 54.9
Fan Speed = 94.7 %; Min 81.5; Max 94.9 (598 rpm; Min 452; Max 609)
Operating time: 4 h 1 min
Temperature Sensors
1: CB-ADC0: 69.2 °C; Min 29.4; Max 70.1; Warning @ 95.0; Device Off @ 105.0
2: CB-FPGA: 59.0 °C; Min 22.0; Max 63.0; Warning @ 90.0; Device Off @ 100.0
3: CB-CPU: 50.6 °C; Min 24.1; Max 51.1; Warning @ 80.0; Device Off @ 90.0
4: CB-TMP432: 53.4 °C; Min 25.1; Max 54.9
Fan Speed = 94.7 %; Min 81.5; Max 94.9 (599 rpm; Min 452; Max 610)