118. Any party may, before the hearing or at any time before the decision provided he shows that he has been diligent, request the recusation of any member of the Tribunal. The request shall be addressed to the president of the Tribunal who shall rule upon the request or refer it to a judge of the Tribunal, in particular where the request concerns him personally.
Any member of the Tribunal who is aware of a valid ground of recusation to which he is liable is bound to make and file in the record a written declaration thereof.