As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT: PITCH TRIM CAUTION LIGHT ILLUMINATED DURING TAXI OUT. RETURNED TO GATE. MAINTENANCE REINITIALIZED PITCH TRIM SYSTEM VIA CYCLING SHIP'S POWER. POWER-UP SELF-TEST NORMAL. PITCH TRIM CAUTION LIGHTS OUT. PITCH TRIM OPERATION NORMAL. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.