As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO DETERMINE FUEL QUANTITY LOSS OF OVER 4200 LBS-800NM. FUEL FLOW TXMTR CHANGED, NEEDS LEAK AND OPS CHECK ON NR 2 ENG. ACP LEAK CHECKED, NO LEAKS DETECTED. COMPLETED FIM 28-41 TASK 825 FQIS AND FMC CHECKED GOOD. REPLACED BOTH NR 1 FUEL FLOW TRANSMITTERS. SUCCESSFUL VERIFICATION FLIGHT ACCOMPLISHED, BOTH L AND R FUEL FLOW SYSTEMS OPERATED NORMALLY.