As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED FLAPS EXTENDED NORMALLY TO 30 DEGREE WHEN 40 DEGREES WAS SELECTED THE FLAP INDICATOR SPLIT SLIGHTLY IN THE 30 DEGREE POSITION AND DID NOT EXTEND TO FLAPS 40. EMERGENCY DECLARED FLIGHT LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NUMBER 3 FLAP SKEW SENSOR. SYSTEM GROUND CHECK NORMAL OPERATION.