As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 120 - EN ROUTE JFK-CDG - DURING CRUISE DETECTED FUEL IMBALANCE BETWEEN RIGHT NAIN AND LEFT MANI FUEL TANKS. FUEL WAS BALANCED EQUAL. FUEL CONTINUED TO IMBALANCE. RETURNED JFK AND LANDED WITHOUT INCIDENT. REPLACED RIGHT SIDE FORWARD BOOST PUMP. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)