Is it possible to move bones which are controlled by an animator

Lets say i’ve animated an eyebrow.
It has an angry and a happy animation ant it works great with mechanim.
Now I want to move the eyebrow in its current state up or down, with a script like that:

public class FacialExpression : MonoBehaviour {
 public GameObject eyebrow;
  static float moveUp = 10.0f;
  void Update () {
    eyebrow.transform.localPosition.y += moveUp;
  }
}

It doesn’t seem to work.
Is there another possibility?

Try using transform.Translate instead. eg. transform.Translate(Vector3.up * moveUp);