As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS GROUNDED. 45 MINS INTO FLIGHT, A FUEL IMBALANCE LIGHT ILLUMINATED. AIRCRAFT INDICATED 2000LBS UNDER THE PLANNED FUEL. FUEL LEAK SUSPECTED , THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO DFW WITHOUT FURTHER INCIDENT. REMOVED AND REPLACED LEFT TANK COMPENSATOR, OPS CK GOOD PER AMM 28-41-21-400-810.