As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - AUTOFEATHER SELECT DID NOT INDICATE ON EICAS DISPLY DURING T/O ROLL. ABORTED AT 60 KIAS, AND RETURNED TO THE GATE. INTERROGATED CDS, FOUND CODES 64 AND 70. PERFORMED AUTOFEATHER TEST IAW AMM TASK 61-20-00-710-801. FAULTS CLEARED IN CDS. NO FURTHER MTX ACTION REQUIRED PER FIM TASKS 61-20-02-810-834 AND 61-20-02-810-835. OPS CHECK OF AUTOFEATHER GOOD. RETURNED TO SERVICE. NO PARTS REPLACED.