(1) Unless otherwise agreed by the parties, the arbitral tribunal may:
(a) Appoint one or more experts to report to it on specific issues to be determined by the arbitral tribunal.
(b) Require a party to give the expert any relevant information or produce or provide access to any relevant documents, goods, or other property for inspection by the expert.
(2) Unless otherwise agreed by the parties, if a party so requests or if the arbitral tribunal considers it necessary, the expert shall, after delivery of a written or oral report, participate in a hearing in which the parties have the opportunity to question the expert and to present expert witnesses in order to testify on the points at issue.