As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO FIELD DUE TO RIGHT ENGINE TORQUE FLUCTUATION. THE SYSTEM WAS TROUBLESHOT AND THE TORQUE STRAIN GAUGE CANNON PLUG WAS FOUND CONTAMINATED. THE CANNON PLUG WAS CLEANED AND A FUNCTIONAL CHECK OF THE SYSTEM PERFORMED WITH ALL INDICATIONS NORMAL.