As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUSPECTED FUEL LEAK FROM THE LT ENGINE AREA. THE FLT. CREW CONTACTED THE MCC AND REPORTED THAT THE LT FUEL QTY HAD DECREASED BY APPROX 4000LBS AND THAT AN ACFT BEHIND THEM HAD REPORTED THAT THEY HAD A MIST COMING FROM THE LT ENGINE AREA. THE CREW IS FOLLOWING THEIR QRH AND RETURNING TO DEPARTURE.