What was found
AIR RETURN. A SYSTEM HYDRAULIC LOSS OF PRESSURE ON CLIMB.DEBRIEFED CREW. ON CLIMB, HYDRAULIC A LOST PRESSURE. CHECKED FOR HYDRAULIC LEAKS IN WHEEL WELLS ON GROUND, NO LEAKS NOTED. HYDRAULIC A RESERVOIR OF AND EICAS STATES 106. EDP OPERATES NORMALLY AT 3000PSI. CREW STATED #1 ENG LOW PRESSURE LIGHT WAS ILLUMINATED. PERFORMED DRY MOTOR #1 ENGINE. ENGINE #1 HYDRAULIC PUMP HAS NO PRESSURE. DRY MOTORED #2, ENGINE #2 HAS 3000PSI.REF: FIM 29-30/812. REQUIRES SYSTEM A FLUSH AND CASE DRAIN FILTER CHANGE. REMOVED #1 ENGINE DRIVEN PUMP IAW AMM 29-11-11-000-801-001 WAITING ON PARTS TO START INSTALL COMPLETED INSTALLATION FROM STEPS 3H(1)(D), (G), 2E, 8. UP TO STEP I INSTALLATION TEST. FILTERS REPLACED ON LPS 9235911, 9235895, 9242136, 9232090, 9232044. PTU CASE DRAIN FILTER NOT REPLACED, REQUIRES REPLACEMENT. REF: AMM 29-11-11-400-801-001. R & R PTU FILTER, REF AMM 29-22-21. PERFORMED GVI OF RELATED ELECTRICAL CONNECTIONS, HYD LINES AND VERIFIED C/BS. PRESSURIZED HYD RESERVOIRS, REF AMM 29-09-00. PERFORMED FUNCTIONAL TEST OF EDP HYD SHUTOFF VALVE REF 29-11-81-710-802. BLED HYD SYSTEM REF AMM 29-00-00.3000PSI. OPS CHECK GOOD.