A year or so ago, in a careless moment during a nude photo shoot, my D3 with the 24-70 mm F/2.8 dropped off the tripod and hit a concrete floor. Seems I was distracted, and released the lever clamp on the ball head without having the other hand wrapped around the camera. How embarrassing!
Long story short, I finished the shoot and took the camera and lens to my local dealer who suggested sending both to Nikon for testing and repair. Turns out that they both required service, as the lens mount suffered as well as the body. The bill was something over $400 US as I recall. Camera and lens are now back to 100 percent.
Lesson learned: Pay attention to what I am doing!
HBB in Phoenix, Arizona Nikonian Team Member
Photography is a journey with no conceivable destination.