As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT LEFT PACK CYCLED ON AND OFF EVERY TWO SECONDS. TURNED LEFT PACK OFF. RIGHT PACK UNABLE TO HOLD CABIN PRESSURE. REPLACED, LEFT PACK FLOW CONTROL VALVE / LEFT ENGINE PRSOV. FOUND RIGHT PACK DUCT SUPPLY TUBE SEPARATED FROM CHECK VALVE. WHEN LEFT PACK SELECTED OFF AND RIGHT PACK AIR-FLOW DISRUPTED, AIRCRAFT UNABLE TO PRESSURIZE.