As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL FUEL TANK WOULD STOP AUTOMATIC FUEL TRANSFER AT APPROXIMATELY 800 POUNDS REMAINING IN TANK. MANUAL TRANSFER WOULD PUMP OUT THE 800 POUNDS. WOULD ALSO GET 'AUX AUTO XFR' EICAS MESSAGE. REPLACED LOWER D-FUEL SENSOR IN TAIL TANK SUMP MANIFOLD. SYSTEM NOW TRANSFERS 'ALL' FUEL OUT OF TAIL WITH NO EICAS MESSAGES AUTOMATICALLY.