As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING WE SMELLED AN UNUSUAL SMOKE SMELL BUT THOUGHT IT WAS FROM OUTSIDE. AFTER STARTING APU AND SELECTING AIR SOURCE ON, NOTICED UNUSUAL SOUND AND SMOKE BOTH IN COCKPIT AND CABIN. SOON AFTER, CAUTION PACK TEMP HIGH CAS MESSAGE DISPLAYED. WE COMPLIED WITH QRH2 THEREAFTER. REMOVED AND REPLACED ACM.