Power armor has to be found on the world map in order to upgrade your suit. T-45d power armor can be repaired using components from the T-51b power armor, but the reverse cannot be done. The second key can be obtained from Dukov, located at Dukov's Place, which is a hotel building. When anyone wearing power armor, including the player character, has a rifle holstered it will be pointing the opposite way compared to any other apparel, this is most easily seen with a.
