As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
T/O WARNING HORN SOUNDS WITH ELEVATOR TRIM IN T/O RANGE. MAINTENANCE REMOVED AND REPLACED ELEVATOR TRIM MODULE IAW Q400 MM 27-32-16-000-801 AND 27-32-16-400-801. C/W TAKE OFF WARNING HORN FUNCTIONAL TEST IAW Q400 MM 31-52-00-720-801. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.