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 GRADUAL SHIFT IN CRUISE DELTA FUEL FLOW INDICATION ERRORS ARE SUSPECT. GROUNDED-YES. ACCOMPLISHED REMOVAL AND REPLACEMENT OF THE FUEL FLOW TRANSMITTER, NO LEAKS FOUND ON THE FUEL FLOW TRANSMITTER, REF B737-900 AMM 73-31-01.