Last year in a moment of stupidity, my rifle tipped off a bench and landed upside down directly on the elevation turret, jamming it into the body. The scope did NOT loose it's zero, but the turret was stuck.
I called Nikon to inquire about repair costs, they said send it in after creating a work order on their repair website. You can log into the repair site and check your repair status. Mine said they repaired it after 2 weeks and it was awaiting shipping. Next thing I know there's a brand new scope sealed in a new box on my doorstep! It took 3 weeks total. All I paid for was shipping both ways. A+ on customer service in my experience.