What was found
UPON STARTING UP THE LH PACK THERE WAS A SMELL THE CREW NOTICED. WHEN THEY LOOKED BACK INTO THE CABIN THEY BECAME AWARE THERE WAS A SLIGHT HAZE. THEY THEN SHUT DOWN THE LH PACK, DEPLANED THE PAX IN A NORMAL MANNER. NO EMERGENCY WAS DECLARED. CREW CALLED MX CONTROL TO DEFER LH PACK. SELECTED LH PACK ON, SMOKE AND LH PACK AUTO FAIL CAUTION MESSAGE / DEFERRED PER MEL 21-61-1(1). TROUBLESHOT LH PACK AUTO FAIL CAUTION MSG IAW CRJ 700 FIM 21-51-00-810-802. DID NOT FEEL ANY AIRFLOW OUT OF EXHAUST OUTLET. DETERMINED LH ACM IS UNSERVICEABLE.