What was found
LEFT HYDRAULIC QUANTITY DECREASED TO .14, EDP DEPRESSURIZED. WITH ELECTRIC PUMP OFF QUANTITY CONTINUED TO DECREASE UNTIL THERE WAS A TOTAL LOSS OF FLUID. AIRCRAFT DIVERTED TO ALB DECLARING A YELLOW EMERGENCY. FLIGHT LANDED WITHOUT FURTHER INCIDENT. INSPECTED AND FOUND LEAK AT RUPTURED O-RING AT DEPRESSURIZATION MODULE PLUG. REPLACED O-RING AND FOUND FERROUS AND NON FERROUS FILINGS IN LEFT CASE DRAIN FILTER. REPLACED LEFT ENGINE DRIVEN HYDRAULIC PUMP (55-2911-9-0014, S/N OFF 22458) AND LEFT ELECTRIC HYDRAULIC PUMP (55-2911-9-0013, S/N OFF 56185.