What was found
FLT#133, BOS-SEA. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' ENG 1 EPR 1 FAULT PUT AC IN N1 MODE NOT ABLE TO MAINTAIN SPEED AT 36K DESCENDED LOW AN STILL NOT ABLE TO KEEP SPEED UP LARGE SPLIT BETWEEN THE ENGINES #1 ENG NOT ABLE TO ACHIEVE CLIMB POWER LARGE FUEL FLOW SPLIT OF 1000LB PER HOUR HOUR BETWEEN ENGINES HALF INCH SPLIT BETWEEN THRUST LEVERS TO MATCH ENGINE PARAMETERS; REPLACED ENG 1 FADEC PER TSM 73-22-00-810-817-B AND OPS CHECK GOOD ON HIGH POWER RUN WITH NO FUEL FLOW SPIT NOTED AT TOGA.'