Good luck getting a bulb changed under warranty.
In the past my wife took my old Punto into the fiat dealer to get a bulb replaced. She had been driving the car a lot and a headlight bulb went out. She tried to change it herself with one from the spare bulb kit but couldn’t get the old one out, so she drove to the fiat dealer round the corner who ended up taking the front bumper off, so they could take the light unit out to change the bulb, they put it all back together for her and when she went to drive off having not been charged a penny the spare bulb she had was still on the passenger seat so they even put a free new bulb in.
At the time the car was about 6-7 years old so well out of warranty