is it true, that after finishing the endurance at FSG, the marshalls will turn off the car with the Primary Master Switch?

Or is it allowed to let the driver stop the engine with the cockpit mounted master switch?

How ist the procedure while driver change?

The rules say:

Other than changes to accommodate the second driver or covered by D3.8.2 “Tire Changing” and turning on and off the car with the master switch, the team is not permitted to perform any work on the car during Driver Change.

I'm asking, because we'll lose our logged data when directly switching of the Primary Master Switch.