As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT 2340 PROP DE-ICE CAUTION LIGHT ILLUMINATED IN ICING CONDITIONS. COMPLIED WITH CHECK LIST AND APPEARS THE NR 1 PROP HEAT WORKS NORMALLY, BUT THE NR 2 PROP HEAT NEVER CAME ON. REPLACED NR 2 TMCU. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.