Chevrolet Silverado Classic 2007 Owner's Manual page 536

3. Pull the turn signal assembly out from the
vehicle.
536
A. Daytime Running Lamp (DRL)
B. Front Turn Signal/Parking Lamp
C. Sidemarker Lamp
4. Press the locking release lever. The
sidemarker lamp does not have a locking
release lever. Turn the bulb socket
counterclockwise and remove it from the turn
signal assembly.