As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 400 L PACK TEMP EICAS MESSAGE FOLLOWED BY L PACK OFF. ACCOMPLISHED QRH AND RESET PACK. PACK LIGHTS EXTINGUISHED AND CONTINUED IN STBY.(<P>PERFORMED BITE TEST ON L PACK TEMP CONTROLLER BOX 1. NO FAULTS NOTED AND OPS CHECK OF L PACK GOOD IAW B767 AMM 21-51-14.</P>)