A TARDIS repair shop was located in the Boulevard of Grand Milieu in the Capitol on Gallifrey. (PROSE: Celestial Intervention - A Gallifreyan Noir)
The First Doctor and his granddaughter stole their TARDIS from this TARDIS repair shop during their escape from Gallifrey. (TV: The Name of the Doctor; AUDIO: The Beginning) The Eleven also stole one from there years later. (AUDIO: The Eleven)
Andro and Fabian worked there. (TV: The Name of the Doctor)