Probably that little motor under there. I have replaced em before. On the bottom of the microwave you remove a couple of screws and a quick connect is about the extent of it.
Never did a fancy one like that before but I would go and find the inventer and break his nose if yall had to take the whole dang thang apart to swap it out. Turntable motor $35
Note: How to advice from APP: You will need to remove the turntable and the coupling. Remove the 5 screws from the bottom of the microwave oven cabinet and remove the bottom plate. Remove the screw, then rotate the motor CCW 1/8 turn. Remove the turntable motor. Disconnect the two wires from the motor