A hearing on an experimental service change as described by § 452.116 to remain in effect for more than 180 days may be held before or during the experimental service change period and satisfies the requirement for a public hearing if the hearing notice required by § 452.118 states that the experiment may become permanent at the end of the period. If a hearing is not held before or during the experimental service change period, the service that existed before the change must be reinstituted at the end of 180 days and a public hearing held in accordance with § 452.118 before the experimental service may be continued.