How do you replace the door lock cylinder on a 1990 300zx?

To replace the door lock cylinder on a 1990 Nissan 300ZX, first remove the door panel by unscrewing any fasteners and carefully prying it off. Next, locate the lock cylinder and disconnect the linkage attached to it. Remove the retaining screw or clip that holds the cylinder in place, then pull the old cylinder out. Insert the new cylinder, secure it with the screw or clip, reconnect the linkage, and reattach the door panel.