I am working on an 02 Grizzly for a guy and he tells me that the thing is running through itself. I'm thinking either the belt is shot ( it's the original one that came with it ) or there is one of the variable speed pulleys that is hanging up or I might be way off base. I don't know a lot about these systems so i'm asking for all opinions and advice

What do you guys think the problem might be?
If it is the belt, what am I looking at to change the thing ?
If it one of the pulleys hanging up, is it a simple polish job depending on the condition of the shaft ?
What is a ballpark price for a belt ?

Thanks in advance