As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, WING TANKS FUEL FEEDING OUT OF CENTER TANK AND WOULD ONLY STOP FEEDING WHEN TURNED RIGHT WING TANK OFF. OPERATIONS NORMAL WHEN CENTER TANK EMPTY. NO TURBULENCE ENCOUNTERED OR LARGE LOAD FACTORS. THE AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED CENTER TANK CROSSFEED VALVE IAW AMM 28-22-21 AND WORK CARDS 28-96-08 AND 28-92-25.