What was found
MONDAY 7/17/203, LEAR 60, N696RB DEPARTED KICT AND ON CLIMB THE CO PILOTS PFD DISPLAYED ERROR MESSAGES INDICATING THE AHRS (ATTITUDE REFERENCE HEADING SYSTEM) FAILED. THE CREW DECIDED TO RETURN TO KICT. BOMBARDIER MAINTENANCE CENTER WAS CONTACTED AND DETERMINED THE #2 AHRS UNIT HAD FAILED. ATI PARTS DEPARTMENT SENT A REPAIRED REPLACEMENT UNIT. BOMBARDIER MAINTENANCE INSTALLED THE AHRS UNIT AND COMPLETED A FUNCTIONAL CHECK, ALL FUNCTIONS FOUND TO BE NORMAL. THE AIRCRAFT HAS MADE THREE TRPS AFTER REPLACEMENT AND NO DISCREPANCIES REPORTED.