What was found
PROP DEICE CAUTION LIGHT INTERMITTENTLY COMES ON WHEN THE NR1 PROP HEAT ENERGIZES. WHEN THE NR 1 PROP HEAT QUITS THE CAUTION LIGHT GOES OUT. PERFORMED EMERGENCY/ABNORMAL CHECKLIST, DIDN'T HELP. ELECTRICAL PAGE SHOWED THAT THE PROP HEAT WAS DWG A LOAD OK. NR 2 PROP HEAT WORKED FINE. RETURNED TO THE FIELD. LANDING UNEVENTFUL. REMOVED NR1 PROP SPINNER, INSPECTED & FOUND NR 2 PROP HEAT DE-ICE HARNESS BURNED. REPLACED DE-ICE HARNESS IAW AMM TASK 61-10-06-400-805. PROP DE-ICE SYS OPERATIONALLY CHECKS NORMAL. REINSTALLED PROP SPINNER. RETURNED TO SERVICE.