As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED "BURNING SMELL IN FLIGHT DECK AND CABIN. MIX VALVES CYCLED FULL COLD SMELL DISSIATED". MAINT REPLACED PACK CONTROL VALVE INITIALIALY, THEN ON SUBSEQUENT FLIGHT THE PACK TRIPPED IN AUTO. ACM REPLACED SNAG CLEARED. ACM OUT FOR OVERHAUL.