As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE TORQUE MOMENTARILY DROPPED ON CLIMB-OUT WITH CTOT ON. AIRCRAFT RETURNED TO FIELD AND MTX DETERMINED THAT THE TORQUE DROP ONLY OCCURS WITH CTOT ENGAGED. MTX DEFERRED THE CTOT AND THE AIRCRAFT CONTINUED ON WITH THE SCHEDULED FLIGHTS.