What was found
THE FLIGHT CREW OBSERVED AN AOA HEAT FAIL - L CAS MESSAGE AT TAKEOFF, THE CREW RAN THE CHECKLIST AND AN MEL WAS ISSUED AND OPERATIONS WERE CONTINUED. DURING THE MAINTENANCE EVENT THE MAINTENANCE TEAM TROUBLESHOT THE LEFT ANGLE OF ATTACK HEAT FAILED CAS MESSAGE. THE TEAM SWAPPED THE LEFT AND RIGHT ANGLE OF ATTACK TRANSMITTERS, AOA FAIL MESSAGE REMAINED ON THE LEFT SIDE. UNITS WERE RETURNED TO THE ORIGINAL SIDES. THE LEFT AND RIGHT DATA ACQUISITION UNITS WERE SWAPPED AND THE FAULT EXTINGUISHED. THE DAUS REMAINED SWAPPED, NO FAULTS WERE FOUND. THE AIRCRAFT WAS RETURNED TO SERVICE.