As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE ACFT WAS TO BE FERRIED FOR MAINTENANCE DUE TO AN AHRS 1 INOPERATIVE MSG. BEFORE THE FLIGHT THE AHRS 1 WAS SWAPPED WITH THE AHRS 2. DURING THE FERRY FLIGHT THE CREW REPORTED THAT AFTER TAKEOFF THEY RECEIVED AN AHRS 1/2 INOPERATIVE MSG. RETURNED TO FIELD & LANDED WITHOUT INCIDENT. SWAPPED THE AHRS BACK TO THEIR ORIGINAL POSITIONS & REPLACED AHRS 1. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.