Today I cleaned the CCD of my D70. On the test shots I made before and after, I found (at least) 3 "over sensitive" pixels. It's not hot pixels, I guess. Until now (more accurate research on this topic is still to be done) my first impression is that these pixels do not depend on the ISO, nor do they depend on the exposure time. They are just brighter (and a little more red) than the pixels around them. They're invisible when located in black/dark areas.

I just hope this isn't gonna develop into a more annoying problem...