BMW X3 Door Issues

Description

For a 2007 BMW X3 3.0D, we need help with the rear passenger doors and driver's side door as there are some electronic issues. Problems include: * The door lock is malfunctioning (sometimes it won't lock and other times it doesn't unlock fully). * The speaker is not working. * The window has come loose (it was fixed a while back, but it seems it was raised too high and fell out of place. Currently, it is inside but slowly falling down. It is secured with tape). The job involves removing the door trim to inspect the issues (wires may be damaged or there might be another problem).