Nil defects : I don't know why. Don't know the AF 777 procedures, but on the 744, the after landing flow (air france procedure) requires the AT switch to be turned OFF. Maybe it is the same on the 777.
Dont Hang Up : The figures come directly from a note written by the AF 777 chief pilot to the AF 777 drivers. The original image is below (in french)
http://img215.imageshack.us/img215/3712/stop777001.jpg
http://img687.imageshack.us/img687/9377/stop777002.jpg