As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3344 - IN CRUISE FLIGHT FROM DTW, THE CREW NOTED INTERMITTENT TORQUE FLUCTUATIONS FROM THE LEFT ENGINE. THE AIRCRAFT RETURNED TO DTW. MAINTENANCE REPLACED THE LEFT HMU, P/N 786391-6, AND THE LEFT ENGINE HARNESS, P/N 3114792-02. THE TSCU WAS REPLACED AS A PRECAUTION. ALL CHECKS WERE SATISFACTORY. REFERENCE MALA965059.