Date registered: Dec 2018
Vehicle: 2000 W203 C180, M111 E20 EVO
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I obviously posted in the wrong forum, but wanted to give a quick update anyway as I solved my problem as this could maybe occur on the W203 AMGs too:
Replacing the door control unit fixed my door lock issue, it works well again. Also, the window of the passenger door did not open by holding my open button pressed, while the three other windows and my sun roof did. After replacing the door control unit, this window opens too!