As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT NR 1 POWERPLANT OUTBOARD CORE COWL SEPARATED UPON THE TAKEOFF PHASE OF FLIGHT. THE PILOTS NOTICED A ABNORMAL VIBRATION AFTER V1 SPEED AND RETURNED TO THE DEPARTURE AIRPORT. DAMAGE WAS SUSTAINED TO THE NACELLE COWL AREA, THE POWERPLANT AND FLAP SYSTEM. THE MALFUNCTION IS PENDING INVESTIGATION.