What was found
IAH- FLIGHT 3797, DURING TAKEOFF THE CREW NOTED THAT THE NR 1 ENGINE HAD A VIBRATION. THE AIRCRAFT DID AN AIR RETURN, AND LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 1 BLADE, NR 1 PROPELLER ASSEMBLY (DUE TO A WORN PIN/ROLLER ASSEMBLY). PERFORMED A OPERATIONAL CHECK, NO DEFECTS NOTED AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.