What was found
AIRCRAFT HAD AN AIR RETURN TO LEJ DUE LT EDP HYD LOW PRESS & DEMAND PRESS LIGHTS ILLUMINATED AND EICAS MSG DISPLAYED LT HYD PRIM PUMP. UPON INVESTIGATION FOUND HYD LINE P/N 272T3100-193 IN LEFT ENG PYLON LEAKING REMOVED & REPLACED DAMAGED LEFT SYS EDP HYD LINE IN PYLON PER MM 20-10-09, REPLACED NR 1 ENGINE HYD PUMP PER MM 29-11-05. REPLACED LEFT ACMP PER MM 29-11-01. REPLACED EDP CASE DRAIN FILTERS PER MM 29-11-17. REPLACED ACMP CASE DRAIN FILTERS 29-11-18. ALL OPS CHECK AND LEAK CHECK ACCOMPLISHED CHECK GOOD.