As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION ABNORMALITY DURING CLIMB OUT. INITIATED DECENT AND GOT CABIN ALT CAUTION FOLLOWED BY CABIN ALT WARNING. RAN QRH (FLIGHT 5101 - FILED CLOSED) C/W PRESSURIZATION OPS CHECK OF AIRCRAFT REF. CRJ M/M 21-31-10, AFTER L/H PRSOV AND R/H ACM WERE REPLACED AND OPS CHECK GOOD.