A cable news program was temporarily replaced with hard-core pornography, shocking viewers who had been watching a health show featuring former NBC News anchor Tom Brokaw. The incident Monday night on KPPX-TV was “an act of human sabotage” at the Phoenix-area station, said ION Television, which operates the station. “We have launched a rigorous investigation, and any implicated employees will face strict disciplinary action and termination,” ION Media Networks spokeswoman Leslie Monreal said in a statement. Brenda Schodt, of Chandler, said she was shocked to look up and see graphic sex acts on her television screen. “Maybe five or 10...