Recommendations on vanos maintenence

I recently picked up an 06 ZCP with 98k on the ticker. So far this car has been solid, but due to multiple owners I've had difficulty getting an idea where to start with maintenance. Long story short, engine is smooth and no signs of anything wrong with the vanos, but I'm not okay with that. My question is what needs to be replaced in the vanos so I can sleep good at night? Thanks in advance!