As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL MIGRATION FROM RT MAIN TANK TO LT MAIN TANK THROUGHOUT FLIGHT. FUEL WAS EQUAL AT TAKE OFF AND ON BLOCK IN. LT MAIN TANK 8.2, RT MAIN TANK 6.8. FMC FUEL BURN EQUAL. REMOVED AND REPLACED TWO CROSSFEED VALVES IAW AMM 28-22-00, OPS CHECKED NORMAL