What was found
LEFT PACK AUTO FUNCTION INOP ( PACK TEMPERATURE CONTROL SYSTEMS (-200/-300) , AUTO MODE), PLACARD INSTALLED. 1484465/21/BWI- REMOVED AND REPLACED LEFT PACK LOW LIMIT VALVE (V131) IAW AMM 21-51-11. OPERATIONAL CHECK GOOD, AUTO AND MANUAL MODES FUNCTION NORMALLY.LOG PAGE 1484468: LH PACK TEMP EICAS MESSAGE UPON PUSHBACK, RETURN TO GATE. PERFORMED PACK TEMP CONTROLLER BITE IAW FIM 21-51-001/101 FIG 103, RAM INLET ACT FAULT. RAM INLET ACTUATOR R & R PCW PER TABLE A. PERFORMED LEFT PACK TEMP CONTROLLER RESISTANCE CHECK, FROM CONTROLLER D 958B PIN B13 TO CONNECTOR D 958C PIN4, PINB15 TO PIN 4. BOTH CHECK GOOD. PERFORMED TABLE B SHEET 3 PACK TEMP CONTROLLER FAULT LIGHT T SHOOTING, BLOCK 1 THROUGH 2. PLW BLOCK 3. PERFORMED CHECK OF WIRING FOR LIMIT SWITCHES. ALL CHECKED GOOD. BLOCK 4 CHECK WIRING FOR POTENTIOMETER, CHECK GOOD. ITEM 5: CHECKED WIRING FOR VALVE DRIVER CIRCUIT, CHECK GOOD. SWAPPED LH & RH RAM INLET ACTUATORS IAW AMM 21-53-03-004/404, FAULT FOLLOWED, RETURNED RAM INLET ACTUATORS TO ORIGINAL POSITIONS. R & R LT RAM INLET ACTUATOR. SYS OPS TEST GOOD IAW AMM 21-53-004/404. PERFORMED GROUND ENG RUN-UP PER GROUND RUN-UP PROCEDURES AMM 72-00-00. ALL SYS OPS NORMAL.