As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED UNABLE TO CONTROL CABIN ALTITUDE AT LOWER POWER SETTINGS. AFTER ARRIVAL MAINTENANCE FOUND FORWARD HEAT EXCHANGE CRACKED/SPLIT OPEN. UNIT REPLACED AND AIRCRAFT RETURNED TO SERVICE. NOTE: THIS HEAT EXCHANGER HAD BEEN REPAIRED FOR (CRACK ALONG INSIDE WELD OF PRIMARY INLET HEADER) IN MAY OF 2002.