Burned highlights are burned highlights, whether it's the Sun or a studio setup with an overexposed flash tube.
If it were me, I'd send the camera back to Nikon with that kind of sensor artifact.
P.S. viewing directly into the Sun through a camera lens can be dangerous, but most of us are doing that at sunrise or sunset, where the luminance is lower due to airmass, humidity, and smog filtering. It's a good thing to be aware of though. There are ways to shoot the sun through big teles or telescopes at high angles, but they all involve heavy filters and eye protection, and that's important.
Exposure Time = 1/2000" F Number = F5.6 Exposure Program = Aperture priority ISO Speed Ratings = 200 Date Time Original = 2006-05-23 19:15:46 Date Time Digitized = 2006-05-23 19:15:46 Focal Length = 300mm
From the time of day and the aperture, it looks very over exposed by forcing the aperture to F 5.6.
What does your histogram look like?
If it is a vertical line at the right side, you are overexposed.
I would have used "Auto" or set the aperture to F 22.