I have a 2020 GLE350. Overtime the passenger door ambient light has gotten dimmer and dimmer. During the day, I can easily see the rest of the ambient lighting, but not that one. At night it is visible, but it is very dim compared to the others. Soon it will be gone altogether. Is there any way to fix this?

 

Probably a failing LED strip inside the door trim. Common issue. Only real fix is replacing the trim piece itself.