Ford Taurus Door Lock problems

Hi

I have ford taurus se 1999 model. Suddenly my driver side door lock/unlock stopped working with remote and inner lock/unlock switch. But it locks and unlocks with the key. All other door lock/unlock works fine with remote and inner lock/unlock switch. I could hear some parts loosen noise near the driver door. But the driver side lock makes click noise but doesn't actually lock/unlock with the remte and inner lock/unlock switch. What could be reason for this failure. This problem I saw when my daughter was pulling the driver side lock from outside when I was trying to unlock the doors using remote. How do I fix this problem myself.

Thanks
Chandra