As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT RETURNED DUE FUEL MIGRATION FROM LEFT TANK TO RIGHT TANK. ELECTRONIC CENTRALIZED AIRCRAFT MONITORING ACTIONS CARRIED OUT. LEFT TANK 600 KILOGRAMS, RT TANK 2900 KLS. ON APPROACH, FUEL WAS MIGRATING BACK TO LEFT TANK. CONFIRMED INDICATION IN CRUISE L2.0 ON APPROACH L1.4. CHANGED FUEL LEVEL SENSING CONTROL UNIT NR ONE. CHECKED FOR FUEL MIGRATION WITH PUMPS ON, OK.