As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON CLIMBOUT FROM CFX4 THE CREW NOTICED THAT THE ALTITUDE CAPTURE DID NOT WORK AT THE PLANED ALTITUDE. FURTHER INVESTIGATION REVEALED THAT THE PRE-SELECT WAS FLAGGED. MAINTENANCE REPLACED THE UNIT WITH NEW AND THE SYS GROUND FUNCTION CHECKED SERVICEABLE.