What was found
FLIGHT 6383 - CVG-STL - WHILE ON VISUAL APPROACH AT APPROXIMATELY THE OUTER MARKER, NOTICED A HOT OR BURNING SMELL IN THE AIRCRAFT. WHILE RUNNING LANDING CHECK LIST, PITOT 3 INOP EICAS MESSAGE APPEARED. MESSAGE CLEARED, BUT SMELL REMAINED. COMPLETED CHECKLIST AND MESSAGE RETURNED AT APPROXIMATELY 500 FEET. UPON LANDING, JUST AFTER THE NOSE WHEEL TOUCHED DOWN, THE F/A NOTICED SMOKE IN THE CABIN. PERFORMED EMERGENCY EVACUATION. MAINTENANCE FOUND PITOT 3 CURRENT SENSOR BURNED AND MELTED. REMOVED AND REPLACED RELAYS K0057, K0058, K0228, K0308, K0248 AND SOCKET XK0057. ALSO REMOVED AND REPLACED PITOT/STATIC 3 PROBE. PERFORMED OPS CHECK OF ALL SYSTEMS, CHECKS GOOD.