I am following the first print instructions in Section 11. Steps 1, 2 & 3 seem to be fine. I can manually extrude PLA. When I comes to step 4 though things go wrong. the hotend is at 200degC and bed is 60degC, if I then select the benchy gcode and say 'yes' to print. Tool0 is not picked up by the tool changer head but the empty tool changer head moves as if it was printing, whilst theT0 extruder sitting in its dock is busy extruding plastic. Any ideas, please, as to what I am doing incorrectly?