Oh, I used to work on this :)

For keeping track of power use and interfaces specifically it turns out doing it all with SysML diagrams wasn't so great. Aside from all the pointless futzing around with boxes and arrows the model eventually became so huge the authoring software could barely handle just opening it up. So it must have been shortly after these slides when all the power use tracking was shifted to a custom tool with a more tabular user interface that we were already using for tracking electrical interfaces (slide 15) with version control in git.