I had a 2004 Citroen, which needed the front sidelight bulb replacing, after investigating for 20 minutes, decided to ask the garage how much it would cost next time it was in.
I did manage to replace those bulbs myself, and it's ridiculous, it has some sort of spring to hold it in place that is extremely hard to open with your fingers, and even harder to close. And on top of that you can't even see it, you have to take first pictures with your phone, understand how it works and then go entirely by tactic feedback