As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT FUEL IN LEFT TANK TRANSFERRED TO CENTER TANK WITHOUT TRANSFER ON. APPROX. 14.5 THOUSAND POUNDS TRANSFERED ON ITS OWN FROM LT TANK TO CNT TANK.A/C RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C AND TRANSFERRED FUEL FROM CTR TANK TO LT TANK IAW AMM 28-26-00. NO FUEL IN CTR TANK AS OF 19:50 LOCAL.AND RETURNED A/C TO SERVICE .