As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 478 - MZT-HMO - THE CAPTAIN REPORT THAT DURING CLIMB MZT-HMO, THE AIRCRAFT HAD HEADING PROBLEMS. THE FO'S WAS OUT OF SERVICE AND THE FLIGHT DIRECTOR BARS WERE LOST WHEN EFIS BOTH WAS SELECTED ON 1, THE PROBLEM WAS INTERMITTENT DURING ALL THE FLIGHT. AT HMO, WERE VERIFIED THE MEMORIES OF DFGC NR 1 AND 2 AND THE AHRS NR 2 WAS CHANGED. IT WAS TESTED IAW MM 24-20-00. (M)