As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACM: OM LANDING WHEN THE APU WAS TURNED ON WE NOTICED A SMELL, THEN A HAZE DEVELOPE IN THE CABIN. ALSO THERE WAS A LOUD SQEAL COMINF FRON THE AC VENTS. THEN WE RECEIVED THE AMBER "PACK TEMP HIGH" MESSAGE. CORRECTIVE ACTION: REMOVED AND REPLACED ACM. REFERENCE CL350 AMM CH 31-52-13.