As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ARRIVAL UPON SELECTING FLAPS TO 5 DEGREES THE FLAP DRIVE CAUTION LIGHT ILLUMINATED THE FLAPS REMAINED AT 0 DEGREES. PERFORMED 0 FLAP LANDING. PERFORMED GVI OF FLAPS NO DEFECTS NOTED. COMPLIED WITH FIM TASK 27-50-00-810-801 AND REMOVED AND REPLACED THE FLAP POWER UNIT . REF Q400 AMM TASK 27-52-01-000-801 AND 27-52-01-400-801 FUNCTIONAL TEST GOOD . NO LEAKS NOTED.