You can replace a failed lamp without removing the signal..
... since the signal lamp socket is located in the hole in the rear shelf, behind the trunk light.
To access the additional brake signal lamp, open the trunk.
Inside the trunk, through the hole in the rear shelf..
... turn the lamp socket counterclockwise and remove the socket with the lamp from the signal housing.
By pressing the lamp, turn it counterclockwise until it stops..
... and remove the lamp from the cartridge.
We install a new P21W lamp in the reverse order.