As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 3908 - PILOT REPORTED, THAT THE LEFT ENGINE EMITTED A LOW RUMBLE/VIBRATION DURING APPROACH. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE LEFT ENGINE AND FOUND THE 2ND STAGE POWER TURBINE TO BE DAMAGED. MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)