Regarding the correctness of the colors in PSB... there are two relevant issues. First, there is the issue of whether the print has faded. I believe that it wasn't faded. Second, there is the issue of whether the color timing on the capture is correct. For that I am less certain. There is no such thing as just grabbing the colors with a camera, you always have to make judgement calls with respect to white balance. Cameras just don't work like our eyes do - even top photo houses prefer to make prints off of negatives if they also have a positive print to use as reference. This is also why I think using the colors in a video shot at a showing in a theater as the basis for color timing a restoration is inherently unreliable.
The bottom line, I think that the colors of the elements in PSB are correct relative to each other - that is, for example, if something is a certain blue in two spots, I would be confident that they really are the same color. (as opposed to PG, where a number of different colors have faded to the same pink).
I know you are concerned about the blues. I would say that if there is something that is a certain blue and you are confident it is correct, then seeing that same blue somewhere else, it is probably correct too. But whether or not everything is too blue, that I don't know. I do know that as I watched it, it did look a little bit more blue than I was expecting. My capture was certainly overly purple, which Adywan corrected nicely.
