As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5588, MCI TO IAH. DURING IDLE DESCENT WHILE DESCENDING AT APPROXIMATELY 2,500 FPM, THE CABIN ALTITUDE WAS OBSERVED TO CLIMB AT 900 FPM ON BOTH CPAM`S. THE FLIGHT LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE PERFORMED PRESSURIZATION CHECKS AND COULD NOT DUPLICATE THE FAULT PER CRJ AMM 21-31-00. (A)