What was found
DURING CRUISE HYD 1 LO QTY AND HYD PUMP EDP 1 FAIL ADVISORY MESSAGES ILLUMINATED HYD 1 LO PRESS CAUTION ILLUMINATED SHORTLY AFTER. RAN QRH PROCEDURE TO COMPLETION HYD 1 QTY READS ZERO. REMOVED FROM SERVICE. PERFORMED NR 1 EDP FAIL INSPECTION/CHECK, REF AMM TASK 05-50-23-200-802-A DPI WERE NOT EXTENDED ON FILTER MANIFOLD. ALSO PERFORMED NR 1 EDP RUN DRY INSPECTION, REF TASK 05-50-23-200-801-A. PERFORMED FIM TASK 29-11-00-810-805-A FOR HYD 1 LO QTY MESSAGE. ALL OPERATIONS AND LEAK CHECKS GOOD. REPLACED NR 1 EDP WAS REPLACED. RETURNED TO SERVICE.