Apollo MDA Control Panel No. 1

I am trying to figure out what this was used for. It looks like this is a power systems test panel for the MDA — the Multiple Docking Adapter that was used in Skylab and the Apollo Soyuz docking module for ASTP. Bus A and B would be the power rails from the fuel cells, and the Airflow Blower might be for the MDA cabin. Thoughts?

There are some photos of an assembled test rack here which was used to verify the interface to the MDA from the CSM before the MDA was attached. Not sure if these panels relate to that though. They think this panel is the “power supply for the MDA ground testing.”

Stickers inside (below) are dated January 1974.