If it shall appear to the court that further testimony is necessary for the proper disposition of the matter, it may hear evidence, or appoint a master to take such evidence as it may direct and report the same to the court with his findings of fact and conclusions of law, which shall constitute a part of the proceedings upon which the determination of the court shall be made. The court may reserve or affirm, wholly or partly, or may modify the decision brought up for review.
53 P.S. § 30667