What was found
NR 1 ENGINE, AFTER ENG START, A FILTER BYPASS LIGHT ILLUMINATED. PUSHED NR 1 POWER LEVER FWD, AND THE LIGHT WENT OUT 30% N1. THE POWER LEVER IDLE- LIGHT CAME BACK ON. PERFORMED A NR 1 EEC BITE TEST. FOUND FAULT FUEL FILTER SIGNALS DISAGREE MSG 73-31071. IAW FIM 73-00-00. REMOVED AND REPLACED THE NR 1 ENGINE FUEL FILTER IAW AMM 73-11-02. IDLE LEAK CHECKED GOOD IAW AMM 71-00-00. R & R THE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH IAW AMM 73-34-01-000-801-F00, AND 73-34-01-400-801-F00, GROUND FUNCTIONAL CHECKED GOOD IAW AMM 73-34-01-400-801-F00, PARAGRAPH G, IDLE POWER LEAK CHECKED GOOD. ACFT GROUNDED.