Although I doubt this is a useful bit or anything since probably someone else is covering this base on your team of restorators, I believe that this movie will be easier to fix the mild fading issue than most others for the basic fact that it provides hard captions as well as much of the footage being hard matted. Theoretically, one can make a white balance using the hard matte as an obvious black point and the captions as a white point.
I made a little test real fast to demonstrate my point (although please note, I forgot the title was “Return” not “Revenge” so minor whoops lol): http://screenshotcomparison.com/comparison/132337