As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDED UNDER AMBER ALERT DUE TO A FUEL TRANSFER PROBLEM. UNEXPLAINABLE FUEL TRANSFER FROM RIGHT MAIN TANK TO CENTER TANK. MAINTENANCE ACCOMPLISHED INTERNAL LEAK CHECK OF SYSTEM BY PRESSURIZING FUEL FEED AND FUELING MANIFOLDS USING AIRCRAFT BOOST PUMPS. AFTER SEVERAL HOURS NO LEAKS (UNCOMMANDED TRANSFER) OCCURED.