As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, VALVE FAILED IN OPEN POSITION. THIS CAUSED EXCESSIVE HOT BLEED AIR TO REACH COCKPIT. PRESSURIZATION WAS DIFFICULT TO CONTROL AND PILOTS WERE SUBJECTED TO EXTREME HEAT. AIRCRAFT HAD TO DESCEND AND LAND AS SOON AS POSSIBLE. ONLY BY SHUTTING DOWN RIGHT ENGINE COULD THIS PROBLEM BE RESOLVED IN-FLIGHT.