I'm with Mel. Sending a camera to a non-certified, non-authorized private repair shop is a lousy bet. Nikon is fed up with the complaints it receives about shoddy service by third-party dummies. Of course there are also a small handful of very good independents, but I've only found one during the past 35 years (or so) of photography.
The service I've received from Nikon Canada has been consistently exemplary. Repairs and maintenance done properly in the first place, and at fair prices. Warranty issues? I don't even need to bring my original store invoice because Nikon Canada, just like Nikon USA and Nikon UK, tracks serials numbers and registrations.
Register your gear online or send in the registration card if there's one in the product box. Makes life easier.