As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE CONDUCTING A SHORT ICE RECONNAISSANCE FLIGHT THAT INVOLVED A NUMBER OF HEADING CHANGES, THE AP DEGRADE AND LFD CAS MESSAGE ILLUMINATED. THIS OCCURRED APPROX. 4 MINS INTO THE HEADING PRESET MODE. HEADING PRESET MODE WAS RESET AND THIS OCCURRENCE THEN HAPPENED AGAIN AFTER 3 (TC# 20190712001)