What was found
ENROUTE, CAPT REPORTED LOSS OF ALL HYD PRESS. RE-ROUTED. GEAR WAS EXTENDED VIA EMER GEAR EXTENSION, LANDED SAFELY WITH NO INCIDENT. EVIDENCE OF HYDR FLUID WAS ON OUTSIDE OF NR 1 ENG NACELLE AND EMPENAGE. AFTER ACCESSING ENG COWL AND OTHER PANELS IT BECAME EVIDENT THAT 2 HYDR LINES HAD CHAFFED TOGETHER RUPTURING 1 LINE AND DEPLETING HYDR FLUID. 2 LINES IN QUESTION WERE ON ENG SIDE OF NR 1 ENGINE PYLON. LINE THAT WAS LEAKING WAS NR 1 ENG HYD PUMP PRESS LINE. OTHER LINE, NR 1 ENG HYDR PUMP CASE DRAIN THOUGH NOT LEAKING HAD A SEVERE CHAFE IN IT. LINES ROUTING WAS CORRECT IAW MM, SOLID LINES. PROXIMITY TO EACH OTHER IS VERY CLOSE IN THIS PARTICULAR INSTALLATION AND CAUTION SHOULD BE TAKEN WHEN INSTALLING. (