Sedan Model

Disconnect the ground cable from battery.
Push the high-mounted stop light backward of the vehicle (1), raise the rear portion of it (2) and remove the clips to remove it.

Fig 1: Pushing High-Mounted Stop Light Backward Of Vehicle, Raise Rear Portion
Courtesy of SUBARU OF AMERICA, INC.
Remove the harness from clamp.

Fig 2: Removing Harness From Clamp
Courtesy of SUBARU OF AMERICA, INC.
Disengage two claws (A), pull out the high-mounted stop light from the cover and remove the claw (B).

Fig 3: Pulling Out High-Mounted Stop Light From Cover
Courtesy of SUBARU OF AMERICA, INC.
Disengage three claws and remove the lens (A).

Fig 4: Disengaging Three Claws And Lens
Courtesy of SUBARU OF AMERICA, INC.
Remove the bulb.