Jason Arnott scored less than two minutes into the third and the Blues held off Phoenix for a 3-2 victory.  Matt D'Agostini and Alexander Steen also buried one for St. Louis, which has won six-of-eight.  Brian Elliott made 24 saves in the victory.  Shane Doan and Keith Yandle each lit the lamp for the Coyotes, who had their two-game winning streak halted.  Jason LaBarbera turned 15 shots aside in the setback.