As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RT PACK AUTOFAIL MESSAGE ON EICAS WITH RT PACK FAILING AFTER START OF ENGINE NR1. MANUAL TEMP SELECTED WHICH RESULTED WITH THE LAV SMOKE DETECTOR ACTIVATING AND SMOKE ENTERING THE AFT CABIN. PACK TEMP OBSERVED AT 98 DEGREES JUST BEFORE AUTOFAIL. THE AIR CYCLE MACHINE (ACM) WAS REPLACED.