As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER DEPARTURE YVR ENROUTE LAX, CREW NOTICED NUMBEROUS FAILURES IN AUTOFLIGHT MODE CONTROL PANEL.NOT ABLE TO SELECT SPECIFIC HEADING. HEADING INDICATIONS ON CAPT/FO EHSI DIFFERENT. UNABLE TO SELECT ALTITUDE, ALSO AUTOPILOT WOULD NOT CONTROL AIRCRAFT TO SELECTED HEADING OR ALTITUDE. CREW ELECTED TO RETURN TO YVR.UPON ARRIVAL YVR, MAINTENANCE REPLACED THE MODE CONTROL PANEL, AIRCRAFT DISPATCHED. NO FURTHER INCIDENT.