As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK CLIMBS CABIN AT 300 FPM WHEN FED FROM RIGHT BLEED. LEFT BLEED FEED OK. REFLY T/S TO FAULTY FLOW CONTROL VALVE. REPLACED FLOW CONTROL VALVE, LEAK AND OPS CHECK GOOD. T/S TO FAULTY FLOW CONTROL VALVE. REPLACED FLOW CONTROL VALVE IAW MM 21-51-01, LEAK AND OPS CHECK GOOD.