As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE HORIZONTAL STAB DE-ICE FAIL AND ASSOCIATED MASTER WARNING LIGHT ILLUMINATED IN FLIGHT WITH MODERATE ICING AT FL250. THE FLIGHT CREW RAN THE CHECKLIST AND COMPLETED THE FLIGHT WITHOUT ISSUE. THE MAINTENANCE PROVIDER TROUBLESHOT AND DETERMINED THE LEFT ELEVATOR HORN WAS DEFECTIVE. THE HORN WAS REMOVED AND REPLACED WITH A REPAIRED ASSY. PERFORMED OPS CHECKS AND SELF-TEST NOW PASSES. RETURNED THE AIRCRAFT TO SERVICE