If a dispute about a matter of mutual interest proceeds to arbitration and any party is engaged in an essential service-
within 30 days of the date of the certificate referred to in section 136(1)(a), or within a further period agreed between the parties to the dispute, the commissioner must complete the arbitration and issue an arbitration award with brief reasons signed by that commissioner;
the Commission must serve a copy of that award on each party to the dispute or the person who represented a party in the arbitration proceedings; and
The commissioner may not include an order for costs in the arbitration award unless a party, or the person who represented the party in the arbitration proceedings, acted in a frivolous or vexatious manner in its conduct during the arbitration proceedings.