(1) Full-board cases. When the hearing on the petition for review has been heard by a majority of the board in a full-board case, and upon completion of the record and submission of the issues for decision and order, a written final decision and order concurred in by them then may be adopted which shall contain findings and conclusions as to each contested issue of fact and law material to the disposition of the matter: Provided, That in the event that the full board considers the record and that four of the members cannot agree on a decision, the substantive decision under appeal will control. The board will formally adopt its final decision and order.

(2) Short-board cases. When the hearing on the petition for review has been heard by two or more board members in a short-board case, and upon completion of the record and submission of the issues for decision and order, a written final decision and order concurred in by them then may be adopted which shall contain findings and conclusions as to each contested issue of fact and law: Provided, That in the event that the three board members consider the record and a majority of the members cannot agree on a decision, the substantive decision under appeal will control. The board will formally adopt its final decision and order.

(3) The board's final decision and order shall be served on each party to the petition for review or to the attorney or representative of record, if any. The board's final decision and order may be served electronically when a party agrees to electronic service. Service upon the representative constitutes service upon the party.