Some former Kennedy Center employees are accusing officials at the performing arts venue of long knowing about structural issues they recently cited as new problems. The anonymous whistleblowers allege in a letter to Congress that top Kennedy Center official Matt Floca halted a funded plan to address roofing issues in April. Floca denies that and says recent investigations revealed new hazards at the building. The center closed temporarily in September as officials cited safety risks from structural deterioration. A judge has ordered a status report by Friday on the temporary closure.