As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MFR FLIGHT NR 2458: AUTO FEATHER DID NOT APPEAR ON ED WITH A/F SELECT. PUSHED AFTER RETURNING TO GATE, A/F PASSED. MAINTENANCE FOUND FAULT CODE 64B BOTH SIDES. C/W F/M FAS 61-20-02-810-834. CLEARED FAULTS, UNABLE TO DUPLICATE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.