As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW CREW REPORTED ON CLIMB OUT FUEL TANK IMBALANCE APPROACHING LIMITS. ALL PUMPS & CROSS FEED VLVS OPERATED NORMALLY. SUSPECTED FUEL TRANSFER PROBLEM. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. UPON ARRIVAL FOUND LT & RT FUELING VLVS IN OPEN POSITION. REFUELED ACFT & VERIFIED FUEL LEVEL USING MEASURING STICKS. SYS GND CHECKED NORMAL, OPERATION CLOSED.