Yes mine is noticable on the track info screen too, the pixels illuminated correspond horizontally to the ones used on the far left. Mine are somewhere between 1/4 and 1/2 brightness, comparing to the four shades the Empeg uses, and so are really noticable. It tends to ruin quite a lot of the visuals.

The question is can this be sorted under warranty? I planned to use the MkIIa in my car, with the MkII as my spare, but until this is sorted I'm gonna have to keep using my MkII because this problem does ruin the look of the unit.

Thanks to everyone for their help!