As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DAILY SYSTEM CHECK THE AUTO FEATHER TEST FAILED TWICE. REMOVED FROM SERVICE. PERFORMED AF + UPTRIM OPS TEST IAW Q400 AMM 61-20-00-710-810. OPS TEST PASS. DEFECTS NOTED AT THIS TIME. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.