What was found
SEA FLIGHT 2391: INTERMITTENT PROP DEICE CAUTION LIGHT WHILE IN ICING CONDITIONS AND PROP SELECTOR ON. ATTEMPTED ONE RESET PER E&A CHECKLIST. PROP DEICE CAUTION CONTINUED TO ILLUMINATE INTERMITTENTLY.RESCHEDULED PER MEL 30-60-1, CAT C, RSI 351658. MAINTENANCE FOUND NR 2 TMCU CD'S FAULTS; OPEN PHASE B/OPEN PHASE C AND OPEN HEATER. ON FURTHER INSPECTION FOUND R5 BLADE DEICER WIRE HARNESS DAMAGED WITH ONE WIRE BROKEN. REMOVED AND REPLACED R5 DEICER WIRE HARNESS IAW Q400 AMM TASK 61-10-06-000-805 AND -400-805. FUNCTIONAL TEST GOOD. FAULTS DID NOT RETURN. CLEARS MEL/RSI. AIRCRAFT RETURNED TO SERVICE.