What was found
ON CLIMBOUT PROP DEICE CAUTION ILLUMINATED INTERMITTENTLY IN CONJUNCTION WITH NR 1 PROPELLER LIGHT. TURNED PROP HEAT OFF, THEN ON IAW EMERGENCY CHECKLIST, CAUTION LIGHT RETURNED, WOULD STAY ILLUMINATED FOR 5-10 SECONDS AT A TIME. HAPPENED ABOUT 10 TIMES TOTAL. RETURNED TO FIELD. LANDING UNEVENTFUL. REPLACED DEFECTIVE NR 1 PROPELLER NR 1 BLADE DE-ICER WIRE HARNESS IAW MM TASK'S 61-10-06-000-805 AND 61-10-06-400-805. PROPELLER DE-ICING SYS FUNCTIONAL TEST AND CALIBRATION GOOD IAW MM TASK 30-61-00-720-802. ALL INDICATIONS NORMAL DURING TEST. RETURNED TO SERVICE.