Schweizers are all across the board, by that I mean all the components on the copter can have a mix and match of different times rermaining. Unlike the R22's where everthing is done at 2200 hours at a huge cost.
Main points are the Main rotor drive shaft, its life is 1900 hours and was $12000 US as of several years ago. Blades last 5500 hours but can go bad before that and they are 14,000 each, you have three of them.
Several years ago Air Flite of Oklahoma faxed me some time sheets showing the life limited component, useful life, and cost to replace. By getting the aircrafts componet times you could calc what a used helicopter would cost run. It can be staggering until you start replacing some of those high priced and due early compoenets.
Also, if you mess up and auto and bend the afy cross beam that is $4,000, on a R22 it's a 1,000.