A female Minneapolis firefighter has accused Fire Chief Bonnie Bleskachek of sexual harassment, job discrimination and retaliation, the third firefighter to sue Bleskachek in the past three weeks. The lawsuit was filed Wednesday in Hennepin County District Court by Kristina Lemon, a captain who has worked as a city firefighter since 1995.The suit, which also names the city as a defendant, alleges that Bleskachek repeatedly made sexual advances toward Lemon, a self-described lesbian who said she is in a committed relationship with another firefighter in the department.