As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PRIOR TO BOARDING PASSENGERS THE FLIGHT CREW NOTED OFF FLAGS ON THE FIRST OFFICER`S ASI, RMI AND ALTIMETER. MAINTENANCE DETERMINED THE ROOT CAUSE TO BE A FAILED NR 2 AIR DATA COMPUTER. THE ADC WAS SUBSEQUENTLY REPLACED AND TESTED SERVICEABLE IAW AMM 34-10-00, OPT 10000. NO FURTHER FAULTS WERE NOTED.