As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO FEATHER TEST "ABORT FAILED" AMBER MESSAGE ON ED. REMOVED FROM SERVICE. FOUND FAULT CODE 494 ON #2 ENG. PERFORMED FIM Q400 61-20-10-810-826. CLEARED CODE. PERFORMED A/F TEST. TEST PASSED. VERIFIED NO CODES AFTER TEST, NO FURTHER MAINT ACTIONS REQUIRED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.