As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON FLIGHT NUMBER 2560, ON APPROACH INTO PDX THE OUTBOARD FLIGHT SPOILERS, OUTBOARD SPOILERONS CAUTION MESSAGE DISPLAYED ON THE SYNOPTIC PAGE. LEFT OUTBOARD WAS AMBER AND RIGHT WAS WHITE. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE LEFT OUTBOARD MULTIFUNCTION SPOILER PCU WAS JAMMED. THE PCU WAS REMOVED AND REPLACED. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.