As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START CHECKLIST WAS COMPLETED SELECTED FLAPS 20 FOR TAKEOFF AND FLAPS FAIL AT 0. RESET THE FLAPS TO O AFTER RESETTING CIRCUIT BREAKER AND RAN THE FLAPS THROUGH FULL TRAVEL WITH NO ISSUES. AFTER TAKING THE RUNWAY FOR DEPARTURE REQUESTED TAKEOFF CLEARANCE CANCELLATION TO RETURN TO BASE. DURING THE RETURN TAXI SELECTED 20 TO 0 AND THE FLAPS FAILED AT 17 DEGREES FOLLOWED BY AN EICAS FLAPS FAIL.