RECALL - Nikon D750 digital SLR cameras manufactured between October 2014 - June 2015 may not function normally
Technical Service Advisory for users of the Nikon D750 digital SLR camera
Thank you for choosing Nikon for your photographic needs.
In February of 2016, we announced in an update that the shutter in some Nikon D750 digital SLR cameras manufactured between October 2014 through June 2015 may not function normally, sometimes resulting in a shading of a portion of images. Since that time, we have learned that the same issue may affect D750 cameras manufactured from July 2014 through September 2014 and from July 2015 through September 2016.
For those who have already purchased a D750 and would like to have their camera serviced for this issue, free of charge, Nikon service centers will service cameras as indicated below. We sincerely apologize for any inconvenience this issue may have caused.
Identifying affected D750 cameras
To check whether or not your camera may be one of those affected by this issue, click the Check Your Serial Number button below and enter your D750's serial number as instructed. . If your D750 camera is one of those that may be affected, instructions for obtaining service will be displayed. If your D750 camera is not one of those to which this issue may apply, rest assured that service to your D750 camera as to this issue is not necessary and you may continue using your D750 camera without concern for this issue.
http://www.nikonusa.com/en/service-and- ... -d750.html