I was driving behind my brother who owns a 2017 GLE 350 and a small bright red light was staying on around his left taillight only which looked like something was stuck on. It hasn't come back on since but I'm stumped. I've attached a picture and pointing to a small area at the bottom right of the left taillight that's half the hight of the white section. This section doesn't seem to light up during braking or running light usage. I can't find anything about it anywhere. Does anyone know why this small section of lighting would every light up? What is it for? Thanks.
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