As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF DEPARTING, WHILE CLIMBING THROUGH 1000' A LOUD BANG EMERGED FROM THE NR1 ENGINE. AN EMERGENCY WAS DECLARED AND THE ACFT RETURNED TO DEPARTURE WHERE IT LANDED WITHOUT INCIDENT. POST FLIGHT INSP WAS PERFORMED NOTING THAT NR 1 ENGINE REQUIRES REPLACEMENT. ENGINE WAS R & R, OPS CHECKS GOOD. NO OTHER DEFECTS NOTED ACFT WAS RETURNED TO SERVICE.