As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2354: FLAP DRIVE CAUTION LIGHT ILLUMINATED DURING TAXI OUT. AIRCRAFT RETURNED TO GATE. MAINTENANCE INTERROGATED CDS AND FOUND NOTHING IN CURRENT FAULTS OR FAULT HISTORY. C/W DHC8/400 FIM 27-50-00-810-801. NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.