GMC Sierra Denali Classic 2007 Owner's Manual page 378

3. Press the retainer clip (B), located behind the
turn signal assembly, towards the outside of
the vehicle.
4. Pull the turn signal assembly out of the
vehicle.
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5. Press the locking release lever, turn the bulb
socket counterclockwise and remove it from
the turn signal assembly.
6. Remove the old bulb from the bulb socket.
7. Install a new bulb into the bulb socket.
8. Insert the bulb socket into the turn signal
assembly and turn it clockwise until it locks.
9. Reinstall the turn signal assembly back into
the vehicle placing the hook and posts on the
inner side into the alignment holes first,
then the outer side into the retainer bracket
until you hear a click.
10. Reinstall the headlamp assembly.