As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED FLAP DRIVE CAUTION ON FINAL. WENT AROUND, ACCOMPLISHED E+A CHECK LIST. FLAPS RETURNED TO 0 DEG AS NORMAL. ACCOMPLISHED FLAPS 35 LANDING, PER THE CHECK LIST. THE FLAP DRIVE CAUTION REMAINED. NO OTHER DEFECTS NOTED. REMOVED FROM SERVICE. REMOVED AND REPLACED FLAP POWER UNIT, IAW Q400 AMM TASKS 27-52-01-000/400-801. FUNCTIONAL TEST OF FLAP DRIVE SYSTEM GOOD. AIRCRAFT RETURNED TO SERVICE.