As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2310 - ON APPROACH TO PDX, CREW RECEIVED A PITCH TRIM CAUTION. TRIM INDICATOR WENT TO FULL NOSE UP AND AUTO TRIM MESSAGES APPEARED ON BOTH PFD'S. NO TRIM WAS AVAILABLE. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE PITCH TRIM ACTUATOR. OPERATIONAL CHECKS WERE PERFORMED AND CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE.