I have a w204 c220 2008 and I am having an issue with the trunk. I can only open the trunk manually by sticking the key into the keyhole and turning it, then opening it normally. However, I can't open the trunk with , the button on the key, or the button on the driverside door. I can hear the mechanism moving, but the trunk doesn't open. I have disassembled the trunk and replaced the trunk actuator (with a used one from ebay) and the same thing happens.