arbitrator may order the parties to take additional witness and evidence. The arbitrator shall make additional resolution within sixty days from the date of receipt of such request. In case of necessity, the

hearing additional facts, the arbitrator may order the parties to take additional witness and evidence. The arbitrator shall make additional resolution within sixty days from the date of receipt of such

hearing additional facts, the arbitrator may order the parties to take additional witness and evidence. The arbitrator shall make additional resolution within sixty days from the date of receipt of such