As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE TE FLAPS FAILED TO EXTEND PAST 10 DEGREES ON APPROACH. ONCE ON THE GND THE FLAPS OPERATED CORRECTLY. THEN FLAP SYS WAS INSPECTED FOR DAMAGE & CLEARANCES AT THE UP POSITION, PERFORMED FUNCTIONAL TEST & OPERATIONAL TESTS, FLAP ASYMMETRY TESTS & LT & RT DEFECTION CHECKS. NO DEFECTS NOTED AT THIS TIME. ACFT RETURNED TO SERVICE. SUSPECT A FLAP ASYMMETRY DETECTOR.