As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2201 - FLIGHT RETURNED TO GATE AFTER THE CREW NOTICED NO INDICATION ON THE RUDDER AND AILERON TRIM INDICATORS. MAINTENANCE RECONNECTED THE CANNON PLUG ON THE AILERON AND RUDDER TRIM PANEL. MAINTENANCE PERFORMED OPERATIONAL CHECKS AND THE CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.