(A) If the mandate of an arbitrator terminates, a substitute arbitrator shall be appointed according to the rules applicable to the appointment of the arbitrator being replaced.

(B) Unless otherwise agreed to by the parties, when the substitute arbitrator is appointed:

(1) Any hearings previously held shall be repeated, if the sole or presiding arbitrator is replaced.

(2) Any hearings previously held may be repeated at the discretion of the arbitral tribunal, if an arbitrator other than the sole or presiding arbitrator is replaced.

(C) An order or ruling of the arbitral tribunal made prior to the replacement of an arbitrator under this section is not invalid because there has been a change in the composition of the tribunal.