As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. RIGHT MAIN FUEL TANK INDICATION DROPPED 5,000 POUNDS IN FLIGHT. REPEATED ON 2/21/17 LHR FLIGHT 142 AND 2/22/17 JFK FLIGHT 105. REMOVED AND REPLACED RIGHT MAIN TANK UNIT NR 14 (AALA20170223010), RIGHT MAIN TANK UNIT NR 15 (AALA20170224003) AND LEFT MAIN TANK UNIT NR 20 IAW AMM 28-41-02. OPERATIONAL CHECK GOOD.