As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OPERATION, THE ACFT WAS UNABLE TO MAINTAIN CABIN PRESSURIZATION ON RT PACK. LT PACK WAS DMI. CLEANED CONNECTOR ON LT PACK TEMP BULB, R & R LT PACK FLOW CONTROL VALVE, RE RACKED AUTO PSI CONTROLLER, R & R LT ACM, R & R LT COMPRESSOR DISCHARGE OVERHEAT SENSOR. NO OTHER DEFECTS NOTED. ACFT WAS RETURNED TO SERVICE.