How much servicing does a 10 year old Avenger 2 require?

Hi, I am thinking of buying a second hand avenger 2 and would like to know how much servicing can I expect to have to/ how frequently (i.e., is the watch prone to issues), and also is it particularly difficult/expensive to service it? I absolutely love the watch but am a bit wary as have been burned in the past.

Thank you Breitling experts/champions.