MY EUREKA MODEL 4702 UPRITE VACUM DIRT CANISTER WAS FULL OF DIRT ,I CLEANED AND WASHED IT .MY WIFE CONTINUED VACUMING AND SMELT SOMETHING BURNING,I STOPPED THE VACUM AND TURNED IT OVER TO SEE IF BRUSHES WERE TURNING. THE VACUM WAS TURNED ON AND THE BRUSHES WERE MOVING FOR ABOUT A MINUTE,VACUM THEN SHUT OFF AND WILL NOT GO BACK ON. PLEASE HELP