| Hi Mark,
as a start, I'd begin with an adjustment layer, setting the white point to the border, which removes some of the brown color.
A more serious attempt is to replace the blue channel, because 90% of the damage is done here.
As a result you'll come out at something like my attachment... its a very quick job, but shows the direction (at least I hope so). Next step would be to heal the remaining color spots with cloning.
hope this helps
Marc |