Subaru 2004 Baja Owner's Manual page 417

Maintenance and service
4. Remove the bulb socket from the tail light by turn-
ing it counterclockwise.
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5. Remove the bulb from the socket by pulling it.
6. Install a new bulb into the socket by pushing it.
7. Install the bulb socket into the tail light by turning it
clockwise until it stops.
8. Install the tail light cover and the tailgate trim.