New owner...first full check-up suggestions needed

[Dan.Magherusan]

Quick question guys [emoji16]
 
I am about to go into the first full check-up of a recently bought 2012 Cayenne 3.0D, 85.000 km, full service history at a Porsche dealer (except last one in 2017, which was done at a private garage)
 
I will replace oil and oil filter, air and pollen filter as this is "default" so to speak, since I don't know the previous owner - the car was bought from a used-car park. Also all 4 brake pads will be replaced because they are almost gone.
 
What would you reccomend I should check / replace, as to be better safe then sorry?
 
Are the following items best replaced or not:
 
Brake fluid?
Differential oil?
Gearbox oil?
Steering fluid? (don't actually know if steering is hydraulic or electronic on the Diesels)
 
...or something else, other that the above? Maybe checking the drain holes?
 
Please share some of your feedback here...as I want my new baby to be in top shape and ready for whatever road-trips I'll throw at her this summer :)
 
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[Quickster2]

Brake system flush, both differentials, transfer case, engine air & cabin filters IMO.