As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING CLIMB WITH ENGINE POWER SETTINGS EQUAL AT 90.0 N1 RUDDER TRIM WENT TO 2.5 UNITS LEFT FOR APPROXIMATELY ONE MINUTE THEN RETURNED TO ZERO. MAINTENANCE ACCOMPLISHED FIM TASK 27-20-F1-H7A-421A-A. WHICH REQUIRED OBSERVATION ON THE SUBSEQUENT FLIGHT TO CHECK THE OBSERVED FAULT SYMPTOM DOE NOT OCCUR. THE FLIGHT CREW REPORTED THAT THERE WAS NO DISCREPANCY WAS NOTED ON THE SUBSEQUENT FLIGHT.