As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON TAXI FOR FLIGHT 2147, RECEIVED A FLAP HALF SPEED MESSAGE. RETURNED TO THE GATE. MAINTENANCE CLEARED THE INHIBIT MESSAGES AND COMPLIED WITH A OPERATIONAL CHECK OF THE FLAP SYSTEM WITH NO DEFECTS. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.