As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAKEOFF ROLL, THE AUTOFEATHER SYS DID NOT ARM UPON SETTING TAKEOFF POWER. THE TAKEOFF WAS ABORTED AND THE ACFT RETURNED TO THE GATE. TROUBLESHOOTING LED TO THE REPLACEMENT OF THE AUTOFEATHER UNIT BEFORE THE ACFT WAS RETURNED TO SERVICE.