What was found
ON TAXI COULD ONLY GET 2040 PSI FROM LT ELEC HYD PUMP ALONG WITH EICAS MESSAGE AND AUDIO. LT ELEC HYD PMP PSI AT 2200. LT ELEC PUMP, ELCU REPLACED, NO HELP. SUSPECT INTERNAL COMPONENT BYPASSING. WILL NEED TO ACP CHECKS. WITH REF TO LOW PRESSURE ON LT ACMP, FIM SUGGESTS THAT THE HYD SYS NEEDS AN INTERNAL LEAKAGE CHECK. (WHENEVER WING & TAIL FLT CONTROL SHUTOFF VLVS ARE POSITIONED TO 'OFF' PRESSURE THEN STABILIZES AT 2800-3200 PSI). IAW SERVICE TIP REPLACE M895 ELCU FOR LT ELEC HYD PUMP. REPLACED M895, NO HELP. REPLACED LT HYD RUDDER AND ELEVATOR SHUTOFF VALVE. HYD PRESSURE NORMAL.