Notification of Illness or Injury While on Retraining and Study Leave. Interruption of a program on Retraining and Study Leave by a serious injury or illness sustained during the leave will not be considered a failure to fulfill the conditions of the leave. Written notice of such interruptions must be forwarded to the Human Resources Division within ten (10) days on Form C138, or by letter to which a doctor’s statement verifying the illness or injury is attached. Such communication, either Form C138 or letter, should be forwarded by certified mail.