As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FUEL TANK BLANKED MOMENTARILY; LEFT FUEL QUANTITIES VARIES BETWEEN 300-500 LBS LOW IN CRUISE. GROUNDED - YES. PERFORMED FQIS BITE PROCEDURE PER B737-800 FIM 28-41 TASK 801. NO CURRENT FAULT FOUND IN FLIGHT FAULTS/ FAULT HISTORY ON LEG 03 PROCESSOR FAILED. MSG NBR: 28-41109. PERFORMED FIM 28-41 TASK 808 AND GROUND TEST PASS THEN THE WAS INTERMITTENT. NO HISTORY 60 DAY.