As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2554 - WHILE AT CRUISE, THE CREW RECEIVED AN AURAL WARNING FOR TRIM IN MOTION. THE AUTO PILOT WAS DISCONNECTED WITH NO CHANGE. THE STAB TRIM WAS DISCONNECTED AND THE WARNING CEASED. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE NR 1 HSTA MOTOR. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.