As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL IMBALANCE. EICAS FUEL HAS HISTORY. [07-13-07] TROUBLESHOOTING FUEL IMBALANCE. FOUND LEAK IN LT MAIN TANK, DEFUELED, SUMPED TANK. FND AFT BOOST PUMP DISCHARGE CHECK VALVE BAD. INSTALLED REPLACEMENT FLAPPER FUEL TANK OVERRIDE VALVE & SYSTEM CHECKED OK DURING VERIFICATION FLIGHT.