A state appellate court panel today upheld a 2012 ruling by a Superior Court judge allowing the elephant exhibit at the Los Angeles Zoo to remain open, but which also directed that its resident pachyderms be given regular exercise and that bull hooks and electrical shock not be used to control them. The three-justice panel of the 2nd District Court of Appeal, in a 2-1 ruling, rejected appeals by both the city and animal rights advocate Aaron Leider.