I can't explain DSE very well myself but here is a link that might help it also talks about line bleed too.
Appreciate the feedback. Good information. Line bleed I realise is a factor with all plasmas it seems. The horizontal extended brightness that comes while scanning the menus and things like that.
These lines are extremely thin and appear as slightly brighter then the rest of the screen, and extend from top to bottom. Ive seen them in other pictures of review model tvs so maybe this is normal. I dont think that they would show up in a photo, but its possible.
If anyone else knows more about this the feedback would be very helpful. Thanks again