Yes, it's one of the more obvious ones with a lot of pixellation and hard edges. I'm no graphic artist - I just used some manual blur, smudge and occasional heal in Gimp. Here's what it looks like in the original (attached)
I didn't want to mess too much with each bit, because I was working separately on the level 9, 8 and 7 versions of the affected tiles, so needed them to still look the same.
It was all a bit ad-hoc - I just saved each scenario where I noticed issues, then hunted down the area in a scaled-down version of the source images (with a numbered grid overlaid to work out the tile location).
In an ideal world, someone could examine and edit the actual source images for re-processing into the tile tree format. If no-one else wants to, I guess I could, and then submit them to Dr S for subsequent processing....