As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT DURING FLIGHT THE ALTITUDE SELECT FAILED, COULD NOT SELECT ALTITUDE. RED ASEL INDICATION WAS ILLUMINATED. THE MAINTENANCE PROVIDER TROUBLESHOT AND DETERMINED THAT THE RIGHT FLIGHT GUIDANCE COMPUTER WAS FAULTY. THE FAULTY UNIT WAS REMOVED AND A REPAIRED COMPUTER WAS INSTALLED. OPERATIONAL CHECKS SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.