The Old Workshops
From Jenny Everywhere Wiki
The Old Workshops were a location on Gallifrey where damaged or faulty TARDISes were stored and repaired. In the Third Universe, and in other, similar realities, it was from the Workshops that the First Doctor stole a TARDIS when he ran away. The Workshops were watched over by Time Technicians such as Andro and Fabian. (PROSE: How To Steal Timeships & To Influence Time Lords)