What was found
PSC FLIGHT 2101 - NOTICED SMOKE COMING FROM BEHIND NR 1 PROP SPINNER. ALL ENGINE NR 1 INDICATIONS NORMAL. MAINTENANCE REMOVED COWL HORSECOLLAR AND LOWER COWL AND OPENED SIDE DOORS AND COMBUSTION SECTION DOORS. VISUALLY INSPECTED ALL FLUID LINES AND WIRING. NO DEFECTS NOTED. VISUALLY INSPECTED PROP DE-ICE SLIP RING AND BRUSH BLOCK. NO DEFECTS NOTED. NO EVIDENCE OF CONTACT BETWEEN PROP SPINNER AND COWLING OR PROP AND HORSECOLLAR. COMPLIED WITH GROUND RUNS AT FEATHER, DISC, FI AND 90 PERCENT TORQUE FOR 5 MINUTES. NO DEFECTS OR SMOKE NOTED. COMPLIED WITH PROP DE-ICE FUNCTIONAL TEST. NO PARTS REPLACED, AIRCRAFT RETURNED TO SERVICE.