What was found
(CAN) AIRCRAFT EXPERIENCED A BURNING SMELL IN THE CABIN, PLUS UNCONTROLLABLE TEMPS FROM THE ECS AND LOUD BANGING THAT COULD BE HEARD FROM THE AFT GALLEY AND AFT CABIN. FLIGHT CREW CONTACTED ATC AND REQUESTED EMERGENCY SERVICES VEHICLES BE ON STANDBY (CREW ELECTED NOT TO DECLARE EMERGENCY DUE TO ONLY A TRACE AMOUNT OF FUMES BEING DETECTED BY CREW AND CABIN CREW INDICATING THAT SMELL WAS DISSIPATING). THE AIRCRAFT LANDED UNEVENTFULLY. MAINTENANCE INSPECTION: THE FLIGHT DECK PACK (ACM) HAD SEVERE DAMAGE TO THE FAN PLUS TURBINE AND COMPRESSOR BEARING FAILURE. MAINTENANCE RECTIFICATION: FLIGHT DECK ACM (P/N 820906-3) REPLACED, IAW AMM 21-51-21. ALSO, OPC OF THE FLIGHT DECK ACM C/O, IAW AMM 21-61-00. (TC# 20180925014)