As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AT CRUISE WITH FUEL IN THE CENTER TANK AND CENTER TANK PUMPS ON FUEL BEGAN TO DECREASE FROM #1 TANK. UPON RUNNNG THE QRH DETERMINED A FUEL LEAK BY TURNING OFF THE CENTER PUMPS AND WATCHING FUEL RAPIDLY DECREASE FROM #1 TANK.<[01] OP/LEAK CHECKED ALL FUEL SYSTEM TANKS; NO DEFECT NOTED REF AMM?S 28-22-00;12-11-00 & FIM 28-21 TASK 803