If you want finer control over your colors, convert the scan to CMYK under Image>Mode. That will give you the 4 channels to work with, and that is what the original was printed with.
I know it's not the same but I was able to get an OK result by selecting your scanned part of your image and playing with the CMYK level output.
You can convert back to RGB afterwards if you want to.
That's how I'm comfortable doing color manipulation, but I have worked on a CMYK press and done some color correcting - it just takes practice to know what to move.