What is the best way to maintain the transmission system of the Vauxhall Movano?

I've noticed that the transmission system of my Vauxhall Movano is not performing as well as it used to. What steps can I take to maintain it and ensure it stays in good condition?

Regularly check and change the transmission fluid according to the manufacturer's recommended schedule to ensure it is clean and at the proper level.

Inspect and replace the transmission filter to prevent debris from clogging the system.

Check for any leaks in the transmission system and address them as soon as possible to prevent further damage.