What was found
ETOPS SIGNIFICANT SYSTEM--REPEAT- LEFT PACK AUTO SHUT DOWN. AFTER APPROX 5 MIN OF OPERATION LEFT PACK DISPLAYED -INOP ANNUN LIGHT- AND THEN SHUTDOWN. PERFORMED BITE OF PACK CONTROL PER 21-51-00 FIG 103, CHECKED GOOD, PERFORMED FIM 21-51-00 FIG 104B CHECKED GOOD, PERFORMED FIM 21-51-00 FIG 106 CHECKED GOOD, PERFORMED FIM 21-51-00 FIG 105, SWAPPED LEFT AND RIGHT PACK OVERHEAT SWITCH CONDITION SAME, PERFORMED FIM 21-51-00 FIG 105B. SWAPPED LT AND RT FLOW CONTROL CARDS CONDITION SAME PER MOC. PERFORMED FIM 21-0-51-00 FIG 105A AND ISOLATED SENSOR (S41) AND OPS CHECK PACK CONDITION SAME THEN ISOLATED SENSOR S555 AND OPS CHECK PACK, CHECKED GOOD. REPLACED S555 COMPRESSOR OUTLET OVERHEAT SWITCH.