As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PROP AUTOFEATHER ARM LIGHT DID NOT COME ON WHEN THE PILOT ADVANCED POWER FOR TAKEOFF, THE CREW REJECTED T/O AT OR AROUND 20KT. AUTOFEATHER CONTROL BOX WAS REPLACED, THE ACFT RETURNED TO SERVICE AFTER OPS CHECK OF AUTOFEATHER SYS BY HIGH POWER ENGINE RUN.