How do you change a rear indicator bulb on a vectra?

To change the rear indicator bulb on a Vectra, first, open the trunk and locate the access panel on the side where the bulb needs replacement. Remove the panel by unscrewing or unclipping it, then twist the bulb holder counterclockwise to release it. Pull out the old bulb and insert a new one, ensuring it's securely in place, then reassemble the bulb holder and access panel. Finally, test the indicator to ensure it’s working properly.