As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, THE CREW NOTICED THAT THE ENG HAD HIGH TEMP & LOW TORQUE INDICATION. THE PILOT THEN ELECTED TO RETURN BACK TO ORIGIN, UNEVENTFULLY. BORESCOPIC INSPECTION OF THE HOT SECTION REVEALED HEAVY RUBBING ON THE CT BLADE TIPS & CT SHROUD SEGMENTS BULGING.