I would agree with what Grumpy says.
36 months and 300 hours.
Anything that wears rather than breaks or fails could be classed as fair wear and tear.
I am not sure how long you would expect an idler pulley to last. Best to ring the dealer and ask. It could even be a common thing.
Obviously blades and belts would not be covered nor engine servicing costs but you would expect most else to be covered.
