As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK INOPERATIVE AND PACK OFF LIGHTS WITH L PACK OFF AND L PACK TEMPERATURE EICAS MESSAGE. AIR INTERRUPT TO ORD FOR REPAIRS. FOUND LEFT PACK COMPRESSOR OUTLET TEMPERATURE SENSOR INOPERATIVE. REPLACED LEFT HAND PACK TEMPERATURE SENSOR. OPS GOOD. SYSTEM GROUND CHECK NORMAL OPERATION.