What was found
(CAN) LEFT ENGINE DUAL ECU FAIL ON BASE LEG. ENGINE SHUTDOWN IN FLIGHT. SMOKE IN COCKPIT NEAR THE LOWER PAX FLOOR. LEFT ECU A UNRESPONSIVE WHEN INTERROGATED BY THE WIZARD SOFTWARE. LEFT ECU B DATA INDICATES A POSSIBLE STICKY GOVERNOR AND A SUDDEN DROP OF OIL PRESSURE AND LEVEL PRIOR TO SHUTDOWN. RIGHT ECU NOT RECORDING SINCE 3/5/19. APPROX 500 HOURS. ENGINE LOG, EVENT RECORDER, AND FAULT CODES COULD NOT BE DOWNLOADED THROUGH THE SOFTWARE.