As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2935 THE CREW REPORTED THAT DURING THE CLIMB THE CABIN RATE OF CHANGE IDICATION WAS INOPERABLE. THE CREW ELECTED TO RETURN TO MSN. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE CABIN PRESSURE ACQUISTION MODULE PER AMM 21-32-01. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.