Action to annul an arbitration award on the ground of failure to address all matters submitted to the arbitral tribunal (Article 32, V). Order for the production of new evidence at first instance. Reversal of the decision. "To grant the production of new evidence and assess it within state court jurisdiction would be to enter into the merits of a matter previously submitted to the arbitrator and, as a consequence, to encroach upon the arbitrator's jurisdiction, which is inadmissible":