As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"ALT LIMITER" CAUTION MESSAGE, FOLLOWED BY DEPLOYING OF OXYGEN MASKS IN CABIN. REMOVED AND REPLACED CABIN PRESSURE CONTROL PANEL REF CRJ 900 MM 21-31-04. RESTOWED ALL CABIN OXYGEN MASKS. OPS CHECK OF CPCP GOOD. NO FURTHER DEFECTS NOTED, PN: GG670-98001-11, SN ON: 00488 SN OFF: 80606.