64. The arbitration officer who is aware of a valid ground of recusation to which he is liable is bound, without waiting until it is invoked, to make and file in the record a written declaration of it.
A party who is aware of a ground of recusation against the arbitration officer must do the same, without delay.
The parties may renounce, by written declaration filed in the record, their right to recuse, but he who is subject to a ground of recusation may refuse to sit, even if recusation is not proposed.