As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE LINED UP FOR TAKE OFF THE CREW RECEIVED A RIGHT HAND AND LEFT HAND PACK FAIL CAS MESSAGE. THE CREW CLEARED THE RUNWAY AND CONTACTED MAINTENANCE CONTROL. MAINTENANCE CONTROL DEFFERRED THE APU BLEED VALVE. FLIGHT 4035 THEN DEPARTED 20 MINUTES LATE WITH NO FURTHER INCIDENT.