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I would have said a burn then maybe a screen pass with a new layer, then just tweak here and there using saturation maybe, i don't know but that's how i would attack it.
done by a burn tool, if you can't find the burn tool, click on a tool (left of the screen mostly) with a little triangle and hold your click, it could be hidden under the 'dodge' tool, there was another one that could be above but i can't remember