As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF THE CREW RECEIVED A LEFT HAND PACK FAIL MESSAGE AND ABORTED TAKEOFF. FLIGHT 4020 CLEARED THE RUNWAY AND THE MESSAGE CLEARED. MAINTENANCE CONTROL HAD THE CREW PERFORMED AN ENGINE RUN AND THE MESSAGE DID NOT APPEAR. FLIGHT 4020 WAS THEN CLEARED FOR ANOTHER TAKEOFF ATTEMPT.