What was found
LT ENG FUEL FILTER ICAS ALERT CAME ON TWICE AT 25,000 FEET LEAVING MEM. REMOVED AND INSPECTED LT ENG FUEL FILTER PER AMM REF 73-11-02-6. NO CONTAMINATION FOUND. PER FIM REF 73-11 FAULT TREE 803, THE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH SHOULD BE REPLACED. REMOVED AND REPLACED NR 1 ENG FUEL FILTER DIFFERENTIAL PRESSURE SWITCH REF AMM 73-34-01-4. REPLACED NR 1 ENG FUEL FILTER ELEMENT REF AMM 73-11-02-4. LEAK CHECK GOOD. LEAK CHECK FOR THE DIFFERENTIAL PRESSURE SWITCH ALSO GOOD. RAN THE NR 1 ENG AT HIGH PWR PER JRH 7, NO FUEL FILTER CLOG EICAS ALERTS. A/C OK FOR SERVICE.