What was found
SMOKE SMELL IN FLIGHT DECK AND CABIN, WITH PACK 1 ON, AND SHORTLY AFTER CABIN TEMPERATURE INCREASED RAPIDLY. (CREW REPORTED SMELL IMPROVED BEFORE GETTING STARTED WITH QRH AND TURNING OFF RECIRCE FAN). MAINTENANCE: UPON FURTHER INSPECTION FOUND AIR CYCLE MACHINE TO BE UNSERVICEABLE REMOVED AIR CYCLE MACHINE IAW AMM 21-51-03. INSTALLED ACM IAW AMM 21-51-03-400-801-A R&R HEAT EXCHANGER IAW AMM 21-51-02 OPS CHECK AND LEAK CHECK GOOD OK FOR SERVICE.