Problem with my camera

Today I noticed a yellowish banding withing some of the shots, so I put up a white piece of paper and do some testing. I got the following results.
I'll probably send the camera in for service but curious what might be the cause of the problem, the shutter, the senor???

D700
Manual, f/2.8 at 1/1000s

for bigger picture of each images
http://www.flickr.com/photos/lunnj2/6064903507/
http://www.flickr.com/photos/lunnj2/6064903501/
http://www.flickr.com/photos/lunnj2/6064903497/

There was no yellowish banding this morning when I took the pictures outdoor, hmmmm, maybe it's my lighting inside the room. Need to do some more checking...

Foolish me, it was the lighting in my room and not the camera... but that's a good news for me.