This is my first post on this board so bare with me. My girlfriend has a 2004 XC70 that I am trying to fix. When we unlock the driver's door it immediately relocks when we pull the door handle to open the door. The driver's door is the only one that does this. It started after a mechanic fixed a window problem in the same door but the mechanic swears it wasn't due to his actions. I am wondering what can I do to troubleshoot the problem? I expect it is most likely a sensor or actuator I will have to replace. Any advice on how troubleshoot and/or replace the sensor or actuator would be greatly appreciated.