As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TAKEOFF REJECTED AT 20 KNOTS FOR A HORIZONTAL STAB CHANNEL 1 FAULT MESSAGE ON THE ENGINE INDICATION CREW ALERT SYSTEM (EICAS), AIRCRAFT RETURNED TO GATE IN WASHINGTON. REPLACED HORIZONTAL TRIM UNIT (P/N 7060-8), HORIZONTAL STAB ACTUATOR (P/N 8396-3) AND MOTOR CONTROL UNIT (P/N 7062-3). FUNCTIONAL TEST CARRIED OUT, FOUND SERVICEABLE.