What was found
(CAN) PILOT REPORTED NR 2 AHRS DISPLAYED TWO RED WARNING FLAGS ON EFIS DISPLAY, ATTITUDE FAIL ON THE EADI AND HDG ON THE EHSI SCREENS. THE PILOT SELECTED NR 1 AHRS TO DISPLAY ON THE NR 2 SCREENS ALL WAS SATISFACTORY WITH NR 1 AHRS MEANING NR 2 AHRS SYSTEM WAS NOW INOP. NR 2 AHRU (ATTITUDE HEADING REFERENCE UNIT) REPLACED WITH SERVICEABLE SPARE, SYSTEM TESTED AS PER PILATUS MAINTENANCE MANUAL. FOUND SATISFACTORY.