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. GROUNDED - YES. REMOVED & REPLACED NR 1 ENGINE FUEL FLOW TRANSMITTER REF AMM 79-31-01. PERFORMED LEAK CKS, OPS CKS AND EEC BITE CKS. ALL CKS GOOD, NO DEFECT NOTED.