What was found
ACFT HAD PROP DE-ICE FAILURE LIGHT. FLIGHT RETURNED TO MX BASE FOR REPAIRS. TROUBLESHOOTING INDICATED DE-ICE TIMER FAILURE. REPLACED AND GROUND RUN AND FUNCTION CHECKED CORRECT. NEXT DAY LEFT ON FLIGHT AND WITHIN 20-30 MINUTES SAME FAILURE INDICATION. DUE TO NO MX AT FWD LOCATION RETURN TO DEPARTURE BASE FOR REPAIR. AFTER MUCH MORE INTENSE SCRUTINY FOUND DE-ICE BLADE LEADS BAD AND REPLACED ALL 4 ITEMS. RUN/FUNCTION AND FLIGHT CHECKED GOOD. NO FURTHER PROBLEMS. SYS NOT MECHANIC FRIENDLY TO TROUBLESHOOTING. LEADS ALMOST NEED TO BE REMOVED FROM BLADE TO THOROUGHLY OHM OUT AND FIND POTENTIAL PROBLEMS.