As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SIGNIFICANT LEFT MAIN/WING TANK LOW FUEL IMBALANCE 5 MINUTES AFTER TAKEOFF, FLIGHT DECLARED EMERGENCY AND RETURNED TO FIELD WITHOUT FURTHER INCIDENT. PERFORMED TANK AND COMPENSATOR UNIT DRY CAPACITANCE AND RESISTANCE CHECK IAW AMM 28-41-21, OPS CHECK GOOD.