How do you change automatic gearbox oil peugeot 407?

To change the automatic gearbox oil in a Peugeot 407, start by ensuring the vehicle is on a level surface and using jack stands for safety. Remove the drain plug to let the old oil drain out completely, then replace the plug. Next, fill the gearbox with new oil through the dipstick tube or designated fill port, using the recommended type of oil for your model. Finally, check the oil level with the engine running and adjust as necessary.