What was found
LOW PRESSURE LIGHT ILLUMINATE SYSTEM A, ENG 1. GROUNDED - YES. AIR TURNBACK -- #1 EDP FAILURE. PERFORMED HYDRAULIC SYSTEM A FLUSH REF B737-800 AMM 29-11-00 DUE TO EDP FAILURE. REMOVED AND REPLACED EDP REF AMM 29-11-11. REMOVED & REPLACED EMDP CASE DRAIN FILTER ELEMENT PER AMM 29-11-41. PERFORMED SYSTEM A FLUSHING REF AMM 29-11-00. FOUND PARTICULATE IN FLUID FROM EDP CASE DRAIN FILTER. DRAINED SYSTEM A RESERVOIR. CHANGED FILTER AS REQUIRED. AGAIN FOUND PARTICULATE IN EDP CASE DRAIN FILTER. PERFORMED HYDRAULIC FLUSHING SYSTEM A REF 29-11-00. COMPLETED OP CHECK OF PUMP OPS & LEAK CHECK GOOD. REF AMM 29-11-11.