I don't remember ever seeing anything on the rear side markers and thus I though I'd post. I'm finding it mildly annoying but judge for yourselves:
1. Remove rear splash shield.
2. Remove screw (1) hidden under inside edge of bumper fascia.
3. Disconnect electrical connector from bulb socket (2).
4. Rotate bulb socket (2) counterclockwise and remove from lamp assembly.
5. Replace #194 bulb (3).
Optionally, depress locking tab on the lamp assembly toward bulb socket and pull lamp assembly out front edge first.