As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED CABIN ALTITUDE CLIMBED TO 8400 AT FL370 EXCESSIVE CABIN ALTITUDE CLIMB AND DECENT RATES DURING CLIMBS AND DECENTS +1500FPM -1000FPM MANUAL MODE DID NOT WORK. MX R & R DIGITAL PRESSURE CONTROLLER WITH OPS CHECKS OF AUTO AND MANUAL SYS SUCCESSFUL. ACFT WAS APPROVED FOR RETURN TO SERVICE.