What is interfering with my Lerp?

Just can't figure this out. I have an object with the following script attached that can be dragged along the Y axis with a mouse/finger, and when it collides with a trigger, it should lerp to another position. I can get the lerp to work without the dragging script, and the dragging script to work without the lerp, but once I put them together, no lerping happens and the object just snaps to 0,0,0. What about my code is interfering with the lerp?

 // DRAGGING VARIABLES
 
     var moveLimit = .5;
     var collisionMoveFactor = .01;
     var freezeRotationOnDrag = true;
     var cam : Camera;
     private var myRigidbody : Rigidbody;
     private var myTransform : Transform;
     private var canMove = false;
     private var yPos : float;
     private var freezeRotationSetting : boolean;
     private var sqrMoveLimit : float;
     private var camTransform : Transform;
 
 // LERPING VARIABLES
 
     var isLerping = false;
     var lerpTimer = 0.0;
     var lerpSpeed = 0.1;    
     var Begin_Rotation = transform.eulerAngles;
     var End_Rotation = Vector3(-90,0,0);
     var Begin_Position = transform.position;
     var End_Position = Vector3(-4.229075,3,2.676687);
     
     
     function Start () {
         myRigidbody = rigidbody;                                    
         myTransform = transform;                                      
         if (!cam) {                                                   
             cam = Camera.main;                                         
         }
         camTransform = cam.transform;                                
         sqrMoveLimit = moveLimit * moveLimit;                       
     }
     
     
     function OnMouseDown () {
         canMove = true; 
         freezeRotationSetting = myRigidbody.freezeRotation;
         myRigidbody.freezeRotation = freezeRotationOnDrag;
         yPos = myTransform.position.y;
     }
     
     function OnMouseUp () {
         canMove = false;    
     }
     
     function OnTriggerEnter (other : Collider)
     {                            
         if (tag == other.gameObject.tag){
             isLerping = true;                        
             }
     }
     
     function FixedUpdate () {
       
         if (!canMove) return;
         myRigidbody.velocity = Vector3.zero;
         myRigidbody.angularVelocity = Vector3.zero;
         myTransform.position.y = yPos;
         var mousePos = Input.mousePosition;
         var move = cam.ScreenToWorldPoint(Vector3(mousePos.x, mousePos.y, camTransform.position.y - myTransform.position.y)) - myTransform.position;
         myRigidbody.MovePosition(myRigidbody.position + move);
       
     // LERPING CODE    
             
         if (isLerping == true){
             lerpTimer += Time.deltaTime;
             transform.eulerAngles = Vector3.Lerp (Begin_Rotation, End_Rotation, lerpTimer*lerpSpeed);
             transform.position = Vector3.Lerp(Begin_Position, End_Position, lerpTimer*lerpSpeed); 
             }
         }