You don't need to remove the lower nuts near the bumper. Two on top and two behind the lower rear of the light unit are all you need. When you open the hood look down behind the unit and you'll see how easy it is to remove. Takes all of 5 minutes to change the bulb.
In many cases you'll find it's not the actual bulb but the contacts between bulb and socket that are the problem. A little spot of high-temp. conductive grease should cure the problem.

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