Here’s the text to the listening from yesterday.
An Airbus A319 with 135 people on board, was en route at FL340 about 20nm north of its destination, when the crew heard a loud noise followed by an acrid smell in the cockpit. The flight crew decided to turn around and return to their airport of origin. During the return they heard the loud noise twice more but the aircraft landed safely back in its origin about 70 minutes after turning around. Maintenance found an exhaust fan bearing was worn and grinding during operation. The fan was replaced later.