As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOTS REPORTED LT PACK CAUTION MESSAGE POSTED ON THE EICAS ACCOMPANIED BY RAPID INCREASE OF THE LT PACK EXHAUST TEMPERATURE AND SMOKE IN THE COCKPIT. PILOTS FOLLOWED QRH PROCEDURE AND SELECTED LT PACK OFF, AND SMOKE CLEARED. UPON LANDING, MAINTENANCE PERFORMED T/S AND FOUND LT ACM FAILED.