As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4168 - LEFT ENGINE ECU (ELECTRONIC CONTROL UNIT) FAILED IN-FLIGHT. AIRCRAFT RETURNED TO FIELD, AIRCRAFT LANDED WITHOUT INCIDENT. PIT MAINTENANCE REMOVED, CLEANED, AND REINSTALLED THE CANNON CONNECTORS FOR THE NP AND P1.8 SENSORS. ALSO, THE CONNECTORS ON THE ECU. WORK ACCOMPLISHED IAW MM 71-00-00 AND STD MAINTENANCE PRACTICES. GROUND RUN CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)