As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 3797 - PILOT REPORTED THAT DURING CRUISE, RIGHT ENGINE BEGAN TO DROP TORQUE. THE CREW SHUT DOWN THE ENGINE AND RETURNED TO IAH WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 2 HMU, PERFORMED ENGINE CHECK RUNS AND APPROVED THE AIRCRAFT FOR RETURN TO SERVICE. (X)