(d) In a judicial, administrative or similar proceeding, an arbitrator or representative of an arbitration organization is not competent to testify, and may not be required to produce records as to any statement, conduct, decision or ruling occurring during the arbitration proceeding, to the same extent as a judge of a court of this state acting in a judicial capacity. This subsection does not apply:

1. (1) To the extent necessary to determine the claim of an arbitrator, arbitration organization or representative of the arbitration organization against a party to the arbitration proceeding; or
2. (2) To a hearing on a motion to vacate an award under section twenty-five of this article if the moving party establishes prima facie that a ground for vacating the award exists.