As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4976 - ON CLIMB-OUT RECEIVED FUEL 1 LOW LEVEL WARNING. FIVE MINUTES LATER, CREW RECEIVED A FUEL IMBALANCE CAUTION FOLLOWED BY A LEFT QUANTITY GOING BLANK. AIRCRAFT LANDED APPROXIMATELY 1,400 POUNDS OVERWEIGHT. FOUND FUEL CONTROL UNIT INOPERABLE. REMOVED AND REPLACED SAME. OPS CHECK GOOD. (X)