What was found
AT 27,000 FT, SMOKE WARNING ILLUMINATED. VISIBLE SMOKE REPORTED IN CABIN. AIRCRAFT WAS DESCENDED WITH BLEED/PACK CONFIGURATION IN LOW/LOW, SMOKE CLEARED. REMOVED LEFT ACM & GROUND COOLING FAN, INSPECTED COMPONENTS FOUND NO DEFECTS. INSPECTED INLETS AND OUTLETS TO HEAT EXCHANGER ACM & GROUND COOLING FAN, FOUND NO OIL/FLUID RESIDUE. PRESSURE WASHED HEAT EXCHANGER, REPLACED HOSE FRAYED FROM WATER SEPARATOR TO SPRAY NOZZLE. OPERATIONAL CHECK GOOD.