As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE TREND DATA SHOWS A SUDDEN SHIFT IN CRUISE DELTA FUEL FLOW. INDICATION ERRORS ARE SUSPECT. ACFT GROUNDED. REMOVED AND REPLACED THE NR 1 ENGINE FUEL FLOW TRANSMITTER IAW AMM 73-31-01. LEAK AND OPS CHECKED GOOD. ALL INDICATIONS NORMAL.