AFAIK, they'll open it in the back room (if it's a care center) and determine whether or not it's been mistreated. If it's poorly soldered, you get a new device (they rarely fix yours, usually replacement on new devices if in stock. Or replace the whole board). If they find it ripped, they'll inform you of the bill to repair. It matters if they have them in stock.

Maybe it's different in Madrid, but that's how they always handled things here at the central NCC.