As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL - FLT 1066 - EN ROUTE MIA-ORD - SHORTLY AFTER TAKEOFF, DETECTED AN UNWANTED FUEL TRANSFER CAUSING A FUEL IMBALANCE. DIVERTED ATL AND LANDED WITHOUT FURTHER INCIDENT. REPLACED FUEL CROSSFIELD VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)