hi got a 5 series bmw central locking playing up in that all doors pop up except drivers door. i open rear passenger door pull up pop up and away to go. when i go to lock the car all doors lock including drivers door except i can feel that when i turn the key i am mechanically pulling down the pop up on the drivers door (its not being pulled down by an electric motor). Any help on removing door panel to expose workings to find out whats wrong i am guessing the motor might be duff or could be lucky and a wire may be off