What was found
FLT 4355 - DURING APPROACH INTO CVG FROM BNA, AFTER SWITCHING THE BLEEDS FROM THE ENGINES TO THE AUXILIARY POWER UNIT, THE CREW SMELLED AND SAW VISIBLE SIGNS OF SMOKE FOLLOWED BY A LAV SMOKE WARNING MESSAGE. THE AIRCRAFT LANDED SAFELY IN CVG. MAINTENANCE HAD THE FLIGHT CREW RUN THE ENGINES AND PERFORM A FUNCTIONAL CHECK OF THE PACKS. NO DEFECTS WERE NOTED. MAINTENANCE INSPECTED THE LEFT AND RIGHT AIR CYCLE MACHINES FOR OIL, INSPECTED THE DUCTING, AUXILIARY POWER UNIT AND AFT EQUIPMENT BAY FOR INDICATIONS OF SMOKE. NO OIL WAS FOUND AND NO DEFECTS WERE NOTED. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)