As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON SHUT DOWN, SMOKE AND BURNING ODOR ENTERED COCKPIT, SLIGHTLY VISIBLE SMOKE. CEASED WHEN PACK WAS SELECTED OFF. FOUND NR 2 AIRCYCLE MACHINE SEIZED UP. REMOVED AND REPLACED NR 2 AIRCYCLE MACHINE IAW AMM 21-51-03-00. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.