4A8-RA-7 was a robot orderly stationed on Anglebay Station, a neutral hospital station located on Telos IV. In 17 BBY, 4A8-RA-7 debriefed former Imperial stormtrooper commander Beilert Valance after he was rebuilt as a cyborg at Anglebay Station.
Sources
Star Wars: The Essential Guide to Warfare Author's Cut, Part 11: Serving the Empire on StarWars.com (backup link) (First mentioned)