As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK OFF EICAS MSG ILLUMINATED AFTER ENGINE START (<P>PLACED ON MDDR 21-51-01-01 </P><P>LP 963669: REMOVED AND REPLACED LOW LIMIT VALVE AS PER AMM 21-51-11. L PACK TEMP CONTROLLER BITE TEST NORMAL AND L PACK OPERATIONAL TEST NORMAL AS PER 21-51-00. MDDR 109563 IS CLOSED. PLACARDS REMOVED AND MCC NOTIFIED. </P>)