As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LEVEL OFF AT FL200 IT APPEARED THAT ELEVATOR TRIM WAS NOT TURNING WHEN COMMANDED BY AUTOPILOT. AUTOPILOT WAS DISENGAGED AND ELEVATOR TRIM WAS FROZEN. AFTER DISENGAGE BELOW FREEZING LEVEL FOR 1.5 MINUTES, TRIM MOVED FREELY. REPLACED LEFT AND RIGHT ELEVATOR TRIM ACTAUTOR IAW EMB 120 MM CH 27-32-02. OPS CHECK GOOD.