As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) POWER ROLL BACK/IFSD DURING DECENT, THE CREW REPORTED ENGINE TORQUE ROLLED BACK AND THEN INCREASED BEFORE ROLLING BACK AGAIN. THE ENGINE WAS SHUTDOWN AND SECURED AND AN UNEVENTFUL SINGLE ENGINE LANDING WAS PERFORMED. TROUBLESHOOTING IS ON-GOING.