Except for procedural questions regarding the process of enactment of any ordinance or its amendment or for appeal for a curative amendment as provided in § 27-2002, the Board shall hear all challenges to the validity of this chapter. In all such challenges, the Board shall take evidence and make a record thereon as provided in § 27-1913, herein. At the conclusion of the hearing, the Board shall decide all contested questions and make findings on all relevant issues of fact, which shall become a part of the record on appeals to Court.