This is certainly a possibility. If you press on the screen in the affected areas does the smudge dissipate for a time? This suggests moisture between the two screens. Or if the smudge moves when you press on it, then there could be a film or particles on the mirror or main lense.
|Originally Posted by hi-rez|
...A technician told me that sometimes moisture can end up between the two panels used for the screen and can cause this sort of issue...