A former Pittsburgh firefighter sued the city Thursday, claiming that about $20,000 he is owed for unused sick time is being withheld because he talked to a reporter two days before his retirement. David Cerminara, 56, of Banksville, "wasn't talking about anything in the fire department" or compromising public safety when he answered a KDKA-TV reporter's questions on May 30, according to his attorney, Samuel Cordes. He is being punished, though, more than a month after he left the city's employ, according to his complaint.