As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ABOUT 400 AGL A FUEL IMBALANCE MSG ON EICAS & MORE THAN 900 LBS FROM TANK 2 TO TANK 1. FUEL IMBALANCE BEFORE TAKEOFF ABOUT 150 LBS. RETURNED TO AIRPORT DURING THAT TIME FUEL BURN REMAINED EVEN ON BOTH TANKS. LANDED WITH IMBALANCE OF 800 LBS. REPEATER INDICATES FCU FAIL. REPAIRED & INSTALLED FUEL CONDITIONING UNIT IAW QAMM 28-41-01. OPERATIONS CHECKED GOOD.