Corrosion Warranty

Sorry to learn of your corrosion problem. I imagine both parts are aluminium but even that will corrode under certain conditions. The door handles and the roof (esp. the leading edge) would be exposed to debris striking the frontal surfaces of the car but I'm surprised the corrosion is under the paint. If you already have the full service records and no paintjob was recorded, it's possible repair work was done by an independent body shop.

I believe original factory warranty in the UK is 4 years vs 3 years in N. America. So your 2010 car's warranty has also expired unless it was extended. If the paintjob was not done by a Ferrari authorized body shop it would depend on that shop's policies. The UK may also have minimum standards required of manufacturers to comply with but that usually only involves "rust-through" (safety) situations. So in all likelihood you're stuck with the repairs unless you have the original work order for a now-defective paintjob.

Frankly, I'm surprised you have surface corrosion issues. Does the car have high mileage? Aluminium corrosion can also be caused by galvanic corrosion whereby the aluminium parts were somehow in contact with nearby metals of very dissimilar galvanic properties such as steel, especially certain stainless steels (screws, particles?) while exposed to water. Body shops that repair aluminium parts must take great care not to contaminate the repaired aluminium parts with iron or steel debris, like from tools, sanding procedures. Aluminium parts need to be well sealed.

I would make sure repairs are done by a body shop that has expertise on aluminium panel repairs or the corrosion will likely return, perhaps with a vengeance.