As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX ON FLIGHT 9850 TAKEOFF WAS ABORTED DUE TO AUTOFEATHER NOT ARMING. ARM LIGHT TESTED GOOD. REPEATEDLY ARMED/DISARMED AUTOFEATHER SYSTEM AND PERFORMED MULTIPULE AUTOFEATHER AND POWER UPTRIM TESTS. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.