What was found
LAS - EMERGENCY LANDING - FLT 085 - "C" - DURING CRUISE ENROUTE FROM JFK TO LAS AT FL 390 THE FLIGHT CREW RECEIVED EICAS MSG FOR L/H HYDRAULIC QUANTITY WITH A L/H RESERVIOR LIGHT ILLUMINATED, L/H HYDRAULIC QUANITY INDICATION WAS .48RF AND DECREASING .08 EVERY 10 MINUTES. QUANTITY DECREASED TO .04 AND STATUS MESSAGE FOR POWER TRANSFER UNIT APPEARED FOLLOWED BY L/H HYDRAULIC QUANITY INDICATION OF 0.00. AIRCRAFT CONTINUED TO LAS AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT SYSTEM AND FOUND A PINHOLE SIZE LEAK COMING FROM A CHAFED AREA OF TUBING CAUSED BY A CLAMP ON THE CASE DRAIN LINE. MAINTENANCE PERFORMED A RYNGLOK REPAIR ON TUBING IAW BMM 20-10-09, PG 801, 810, 828-831. LEAK CHECK OF REPAIR WAS GOOD UND