Subaru Legacy 2.0 se sport tourer

[Terry82]

Hi I’ve just become the owner of my first Subaru . Well chuffed!  as parents had plenty on the farm we used to send to Scrap yard after many happy hour in the fields and around the forest roads!   
It’s 2.0 es legacy sports tourer 50,000 miles diesel boxer engine! 
just wondered what I should be looking out for in terms of problems should of asked ? Before I bought it but that’s water under bridge now the Subaru’s  on the farm were 20yrs ago so not much knowledge of the newer ones . 
thanks terry