What was found
LEFT EDP FAILED TO ACTUATE REF TASK CARD 27-0529-8-0047 PULLED CB P11 B5 & B20 P110 L19 & M28 P210 L4 & L5 P310 D4 & D5, AND TAGGED APU START SWITCH. BEGAN REMOVAL STEPS UP TO DEPRESSURIZING. NEW PART AND ORINGS STORED IN COCKPIT REMOVED AND REPLACED LH ENG EDP SUPPLY SHUTOFF VALVE REF AMM 29-11-30. OPS CHECK AND LEAK CHECK GOOD.PARTS USED: 25-2911-9-0020,QTY :1 ROTABLE PARTS CHG:TT # 1714797 SN OFF 2706 PN OFF 25-2911-9-0020 IPC REFERENCE # NO COMPONENT FOUND M&E OFF 25-2911-9-0020 SN OFF 2706 - S/N ENTERED IS INVALID ADDING SDR INFORMATION.