As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK HIGH PRESSURE ON CLIMB OUT RESULTING IN CABIN ALT CAUTION/WARNING MESSAGE. RAN APPLICABLE QRH & RETURNED TO FIELD. MEL 21-51-1CCAT. RT PACK ALREADY DEFERRED. (FLIGHT 5514) DEFERRED LT PACK WITH RT PACK ALREADY DEFERRED PER MEL 21-51-1C. MX ACTIONS COMPLIED WITH. PLACARDS INSTALLED. DURING ECS HEALTH CHECK, LT PRSOV FOUND ON HIGH END OF LIMIT FOR SINGLE PACK OPERATION. REMOVED AND REPLACED LT PRSOV IAW AMM 21-51-43, OPS CHECK GOOD. REMOVED MEL.