What was found
SHORTLY AFTER TAKEOFF AND AFTER WE HAD RECEIVED AHRS 2 FAULT WE RECEIVED AHRS 1 FAULT. IT WAS INTERMITTENT UNTIL LANDING AND THEN RETURNED TO NORMAL. REMOVED INTERMITTENT NR 1 GMU44 AND INSTALLED CUSTOMER SUPPLIED REPAIRED GMU44, IAW PHENOM 300 AMM 34-21-02. SOFTWARE DOWNLOAD, CALIBRATION AND OPERATION CHECKS GOOD, IAW PHENOM 300 AMM 34-21-02. NO DEFECTS NOTED. REMOVED INTERMITTENT NR 2 GMU44 AND INSTALLED CUSTOMER SUPPLIED REPAIRED GMU44, IAW PHENOM 300 AMM 34-21-02. SOFTWARE DOWNLOAD, CALIBRATION AND OPERATION CHECKS GOOD, IAW PHENOM 300 AMM 34-21-02. NO DEFECTS NOTED.