As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L PACK INOP AND L PACK TEMP EICAS DISPLAYED ENROUTE AT CRUISE FL390, STANDBY "N" SELECTED PER QRH, PACK RESET SWITCH PUSHED AND EICAS REMAINED CLEARED WITH STANDBY *N* SELECTED.(<P>PERFORMED FIM TASK 21-51 FT 844. OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME.</P>)