Hi Efiste -
When I first brought up the subject of a color profile for your printer, I had no idea whether you might have been using some really low end or business model scanner, or if you were using something more appropriate for color critical work.
Fortunately, with respect to color critical work, your v550 is reputed to be quite a reasonable machine. It turns out that I own a v700, and nerd that I am, I did get my particular v700 individually profiled when I first got it a few years ago. The corrections that the profile made were fairly small, and my guess is that they will be small for your v550, as well. In contrast, I also own a nice Epson business scanner (fast auto feeder, 2 sided copying, etc.) for my home office paperwork, but to get halfway decent color out of it requires such major color corrections, I only use it for business purposes.
BTW, while we are on the topic of scanners, Epson calling this series of scanners "film scanners" really stretches Epson's credibility. Yes, the the v500 - v850 series will do a decent job on 4x5's and and excellent job on 8x10" sized transparencies / negatives, but for several reasons, even the v800 or 850 are considered only marginal for scans of high quality 35 mm slides. Because of this, I use my v700 only for reflective originals, never for transparencies. I get much higher quality digitization of slides at much faster speeds by using a slide copying adapter on one of my DSLRs.
OK ... on to the image that you posted. As I think you have already surmised, the years have taken a major toll on that image. From the lack of dust, scratches, & problems like that, it looks like the tranny was stored well, but unfortunately the color corrections that it needs are huge, at least compared to the minor corrections scanner color profiles typically give. To make matters worse, it looks like the color shifts and fading are not quite the same in different areas of the image. That meant that I wound up having to mask various areas and correcting them separately.
Anyway, here's my quick attempt to restore that image.
I hope you like one of these.
Cheers,
Tom M