As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: POSSIBLE FUEL LEAK ON MAIN TANK 1, DURING TAKEOFF LOST 1800LBS IN LESS THAN 2 MINUTES, FUEL IMBAL INDICATION IN TANK 1 SHOWED UP. AIRCRAFT AIR INTERRUPTED TO AND LANDED SAFELY AT LAX. ACCOMPLISHED HIGH POWER ENGINE RUN AND LEAK CHECK NO LOST OF FUEL FROM LEFT MAIN TANK NO FUEL IMBALANCE NOTED NO EXTERNAL FUEL LEAKING NOTED. PER FIM TASK 28-21-00-810-803 TO STEP C.