As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED DUAL BLEED HOT CAUTION LIGHTS WHICH CLEARED IAW THE CHECK LIST BUT THEN THE ACFT HAD NO ECS FLOW AND WOULD NOT PRESSURIZE. ON THE GROUND THE FAULT CONTINUED WITH NO ECS FLOW ON APU BLEED AIR. MAINTENANCE FOUND A FAULTY PACK FLOW CONTROL VALVE, STUCK CLOSED.