69. Upon request of any of the parties, the arbitration officer on grievances may, if he considers it necessary, visit the place of employment relating to the grievance he is seized of.
If the request is accepted, the arbitration officer shall invite the parties to accompany him.
When visiting the place of employment, the arbitration officer may examine any moveable or immoveable property. He may also on such visit, if the parties present assent to it, interrogate the persons who are there.