As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT CREW REPORTED COMPASS HEADING ISSUES. CAPTAIN`S HEADING 20 DEGREES OFF. CORRECTIVE ACTION: R&R NR 1 AHRS. SEE ALSO FAA SDR NR 2019010100770/SIMA201804238009. SEE ALSO FAA SDR NR 2019010100771/SIMA2018042380008. (TC# 20180423019)