Just Joined and a query already

[Fife Bravo]

Bought an 08 plate Bravo 105 Eco Mjet. Noticed very small spot of corrosion under lacquer on back alloy wheel. Fiat Dealer says wheels only get 1 year warranty? Can anyone tell me if this is correct? Also how can I find out if my car has the 5 year warranty that Bravo's were first advertised with.

Thanks in advance for any assistance.

Cheers.