Chevrolet 2007 Silverado 1500 Pickup Owner's Manual page 532

3. Pull the turn signal assembly out from the
vehicle.
532
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.