What was found
CREW REPORTED, NR 1 HYD SYSTEM FAILED IN FLIGHT WITH NO PRESSURE AND NO FLUID LEVELS. CREW DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND PERFORMED REPAIR TO PRESSURE LINE FROM NR 1 ENGINE DRIVEN PUMP AFTER FINDING LINE CHAFED THROUGH AT CLAMPING POSITION. HYD SYS NR 1 EDP AND CASE DRAIN MANIFOLD ASSY FILTER ELEMENT WERE R & R DUE TO EXTENDED OPERATION WITHOUT FLUID. SEVERAL BLOCK CLAMPS ON NR 1 HYD SYS PLUMBING LINES WERE R & R FOR BEING WORN BEYOND SERVICEABLE LIMITS. MAINTENANCE SERVICED NR 1 HYD SYS AND PERFORMED CHECKS. ACFT RELEASED FOR SERVICE. ALL WORK ACCOMPLISHED BY MAINTENANCE IAW AMM.