ยง 7507. Award; form; time; delivery. Except as provided in section 7508, the award shall be in writing, signed and affirmed by the arbitrator making it within the time fixed by the agreement, or, if the time is not fixed, within such time as the court orders. The parties may in writing extend the time either before or after its expiration. A party waives the objection that an award was not made within the time required unless he notifies the arbitrator in writing of his objection prior to the delivery of the award to him. The arbitrator shall deliver a copy of the award to each party in the manner provided in the agreement, or, if no provision is so made, personally or by registered or certified mail, return receipt requested.