As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN THE CLIMB THE CAPTAIN WAS NOT ABLE TO ADJUST HIS BAROMETRIC SETTING FOR HIS ALTIMETER. THE ACFT RETURNED TO THE DEPARTURE AIRPORT. MAINTENANCE REPLACED THE LT AIR DATA COMPUTER AND RETURNED THE ACFT TO SERVICE. PN 822-0372-445, SN 1L59R. PART TSR 6727, CSR 5132. A/C TSN 19921, CSN 15202.