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Tricky one. I first tried using Color Range but it wasn't satisfactory. Here's a method that may work for you.

• Open a Black & White adjustment layer above your image.
• Move the Red and Yellow sliders all the way to the right. Move all the other sliders all the way to the left.
• You get this:

[ATTACH=full]149818[/ATTACH]

• Go to the Magic Wand. Set the tolerance to 100 and un-check the Contiguous box.
• Click the magic wand on an area of white and then invert the selection.
• With that selection active, open a Hue & Saturation adjustment layer. (And then turn off the B&W adjustment layer.)
• Go into the Layer mask setting of the Hue & Sat and change the feather to about 9 pixels to get a very feathered selection.
• Click the Colorize box in the Hue & Sat layer. Separately adjust the Hue and Saturation sliders to get the new colors you like.
• Here's what it looks like in red.

[ATTACH=full]149819[/ATTACH]

• As final step, open a new layer at the top of the stack and change the blend mode to Color.
• Use a soft brush with the Flow set to about 25%. Select the gold color and paint gold over the border areas between red and gold where we can still see the original blue color showing through.
• Open another new layer with blend mode of Color. With the same soft brush, dab-in some red in the same transitional border areas to make it seem as if red is showing through instead of blue.
• Here's the final result. Note that red is probably the most difficult new color I could have chosen. This would all work much better if the new color weren't so extremely different from what you started with.

[ATTACH=full]149821[/ATTACH]