Here is the thing. If you have a Convention Manual which calls for a certain color for bike sheds, then you use that. Failing that, if you have several other bike sheds of a certain color, then that's what you use, for consistency with existing bike sheds. The color of the bike shed only doesn't matter if it's the only bike shed, and there is no documentation which has already settled the matter.
We are a continuous learning organization, and selecting this bike shed’s color is an opportunity to leverage everything we’ve learned since the last bike shed project. It’s a fast moving space, and we’re a different team at a different point in time. The color we selected in the past may not be the right color today. In fact, this is an ideal time to consider a bike shed color transformation program to update all legacy bike shed coloring for consistency.