German treble winner Bayern Munich, which is coasting to the Bundesliga title again this season, has been ordered to close part of its stadium for the UEFA Champions League game at home to ManchesterUnited next month for “discriminatory behavior” by the club’s fans, who displayed “an illicit banner” during its round of 16 series at home to Arsenal earlier this month. Bayern will have to shut”Sector 124″ of the Allianz Arena for the quarterfinal second leg on April 9.