An engineer friend of mine asked, "Why does Nikon use grease to lubricate?"

Patco wrote:

Nikon told D200 owners they would adjust the banding problem many experienced:

"Nikon has discovered that a limited number of early-production D200 cameras may, in specific and uncommon shooting conditions, record images that can present an excessive pattern of fine pitch lines throughout (long banding)."

http://support.nikonusa.com/app/answers/detail/a_id/13872/kw/d200%20banding/session/L3RpbWUvMTM1MzUwNzIxNC9zaWQvYXBEQXlRYmw%3D

When the problem is undeniable, they sometimes issue "Service Advisories", like the D5000 problem:

http://www.nikonusa.com/en/Service-And-Support/Service-Advisories/gezwvxil/D5000-Service-Advisory.html

Among other major issues, there was also a Service Advisory for the D70 BGLOD problem.

Some other Service advisories here:

http://www.nikonusa.com/en/Service-And-Support/Service-Advisories/index.page

--
Patco
A photograph is more than a bunch of pixels