As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE BURNS 400 TO 600 LBS MORE FUEL THAN RIGHT ENGINE AT CRUISE. REMOVED AND REPLACED NR 1 ENGINE.THIS ENGINE WAS A PLANNED REMOVAL DUE TO PERFORMANCE DETERIORATION. IT WAS A HIGH TIME ENGINE - 17520 TSO - AND EXHIBITED HOT SECTION DISTRESS TYPICAL OF AN ENGINE WITH THIS TSO.