As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4018 THE CREW REPORTED THAT THE FLAP FAILED WHEN SELECTING FLAP 9 ON APPROACH INTO ORD. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED FLAP SCREW JACK ACTUATOR GEAR - LUBRICATION IAW FIN REF 27-51-00. FOLLOWING FIM REF 27-51-00. FILLED ALL ACTUATORS. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.