As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEARD A LOUD BANG ON TAKEOFF. N1 & N2 SEIZED ON NR 1 ENGINE. NR 1 ENGINE WAS REMOVED AND REPLACED. LPT 3 BLADE EXHIBITED SIGNS OF FATIGUE IN THE SHANK NECK AND RELEASED BELOW PLATFORM RESULTING IN THE FAILURE OF THE REMAINING LPT3 TURBINE BLADES. (S)