What was found
NR 2 ENGINE WON'T SHUT OFF. NR 2 ENG AFTER SHUTDOWN, NOTED FUEL FLOW STUCK AT 1400. TRIED TO SHAKE CUTOFF SWITCH - NO HELP. CYCLED TO ON AND BACK TO CUTOFF, AFTER MORE THAN 30 SECONDS OFF WENT TO ZERO. THEREAFTER, SMELLED STRONG FUEL ODOR. ALSO RAMP SVC REPORTED TAIL PIPE FLAMED AND HEAVY SMOKE. ALSO NOTED, STATUS MSG 'RIGHT FUEL VLV'. REPLACED NR 2 ENG FUEL SHUTOFF SWITCH. SUSPECT NR 2 FUEL CUTOFF SW INTERMITTENT. REPLACED NR 2 ENG FUEL SHUTOFF SWITCH. STARTED ENG 2XS WITH POSITIVE SHUT DOWN.