As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN, NR 1 ENGINE FAILED AFTER TAKEOFF AT 1000 AGL-FLEX PWR T/O AT 1000 AGL. WE HAD AN ABRUPT BANG AND VIBRATION AND NR 1 ENGINE ROLLED BACK. ENGINE WINDMILLED N1 30 PERCENT TILL LAND-EGT WAS OK. DID NOT NOTICE OIL PRESSURE. DID NOT TRY TO RESTART ENGINE. NO SMOKE OR FLAME NOTICED. REMOVED AND REPLACED NR 1 ENGINE. OPS AND LEAK CK OK.