What was found
THE A/C RETURNED TO THE FIELD WITH THE NR 1 HYD WENT TO ZERO PRESSURE AND QUANTITY. IT WAS DETERMINED THAT THE NR 1 EDP FAILED. MAINTENANCE ALSO FOUND A CRACKED HYD LINE IN THE AFT EQUIPMENT BAY. MAINTENANCE REPLACED THE NR 1 DEP BUT WERE UNABLE TO INSTALL A FLEX LINE DUE TO THE LINE POSITON. CURRENTLY AOG FOR HYDRAULIC LINE. HYDRAULIC LINE TUBE ASSEMBLY P/N MM-670-75620-001. AIRCRAFT RETURNED TO SERVICE. (M)