How do you replace rear light casing on vauxhall insignia?

To replace the rear light casing on a Vauxhall Insignia, first, open the trunk and remove the trim panel to access the rear light assembly. Disconnect the electrical connector, then unbolt the light casing using the appropriate size socket or screwdriver. Carefully pull the old casing out and replace it with the new one, reattach the bolts, reconnect the electrical connector, and finally, replace the trim panel. Test the lights to ensure they are functioning properly.