As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2256 - ON SHORT FINAL, WHEN FLAPS WERE SELECTED, THE CREW RECEIVED A MASTER CAUTION FOR THE FLAP DRIVE. AFTER THE LANDING CHECKLIST AND FLAPS WERE SELECTED TO ZERO, THE FLAPS REMAINED AT 15 DEGREES. MAINTENANCE INSPECTED THE SYSTEM AND REPLACED THE FLAP TORQUE TUBE AND SENSOR. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.