What was found
JUST LEVELED IN CRUISE FLIGHT WHEN EICAS CAUTION - L HYD SYS PRESS AND RUDDER RATIO. COMPLIED WITH QRH CONTINUED TO MEM DECLARED EMERGENCY AND LANDED IN MEM. FACT 24FEB22 21:21 MEM U SUSPECT THE LH ENGINE DRIVEN PUMP SHAFT SHEARED. REMOVED THE LH ENGINE DRIVEN HYDRAULIC PUMP P/N 350880-6 S/N MX406133 AND REPLACED WITH ENGINE DRIVEN PUMP P/N 350880-6 S/N MX-517000, REFERENCE THE B757 AMM 29-11-05-4-1. REMOVED AND REPLACED THE LH ENGINE DRIVEN PUMP PRESSURE AND CASE DRAIN FILTERS (NOTE: NO DEBRIS OR CONTAMINATION FOUND DURING FILTER CHANGE.) REFERENCE THE B757 AMM 29-11-17-4. RAN THE LH ENGINE REFERENCE THE JRH, OPERATIONAL AND LEAK CHECK GOOD. A/C OK FOR SERVICE.