What was found
AT CRUISE ALTITUDE FL 410 WITH AUTOPILOT ENGAGED, AN AMBER BOXED A APPEARED, FOLLOWED BY A RED BOXED A ON BOTH PFD'S. COPILOT BELIEVES THE RED ARROW WAS POINTING LEFT. PERFORMED STEPS 4 C 1-4 OF AILERON TRIM TAB ACTUATOR REMOVAL IAW MM 27-11-07. INSTALLED NEW AILERON TRIM TAB ACTUATOR IAW MM 27-11-07 4 D 1-8. RIGGED AILERON & TAB IAW MM 27-11-00. PERFORMED AILERON TRIM ACTUATOR LUBRICATION IAW CE-560 M/M 12-21-01. PERFORMED AUTOPILOT DISENGAGEMENT AND WARNING TEST IAW 22-11-03, AUTOPILOT TEST CHECKED GOOD. INSPECTED CONTROL PATH FOR AILERON TRIM IAW MM 27-11-00.