As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4328 - DE-ICE BOOTS AND PROPELLER HEAT FAILED AT 19,000 FEET IN LIGHT TO MODERATE ICE. BOTH BOOTS FAILED. CREW DECLARED AN EMERGENCY. AIRCRAFT LANDED SAFELY. MAINTENANCE REPLACED THE DE-ICE MONITOR. OPERATIONAL CHECKS WERE GOOD. NO DEFECTS WERE NOTED. AIRCRAFT RETURNED TO SERVICE. (X)