As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLAP DRIVE CAUTION MESSAGE DURING TAXI. FLASHES OFF AND ON 5 TO 6 TIMES. RETURNED TO THE GATE. DURING TAXI BACK TO THE GATE, DID NOT FLASH. AIRCRAFT FERRIED TO PDX FOR REPAIRS. MAINTENANCE REPLACED THE FLIGHT/TAXI SWITCH. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.