I believe it was from a lens change. I remember well your posts and it was my first questions to the staff at store. I saw no spots when new.After first change I was looking at the sky with the 70-300 lens and noticed spots. I returned and the guy definitely saw them too. He first wanted me to take it back to Nikon office here,but I said nopes.So he gave me a new one. I do notice one tiny spec now,but not bad enough. I do know that it was on the CCD as the mirror was spotless.So were the lenses. I believe the composite material it is made of and the fact digital has more static is a contributing factor. If it happens again I will go to the Nikon office an demand a new one. Maybe a D100 as they are metal.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."