As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERY STRONG SMOKY SMELL IN CABIN AT FL370. AFTER LANDING WHILE APU WAS RUNNING THE PAC ISOLATION VLV OPEN, THE COCKPIT BEGAN TO LOOK HAZY & HAD STRONG SMOKY SMELL. REMOVED AFT ACM & VERIFIED TURBINE WAS SEIZED. ACCOMPLISHED SERVICE LETTER SL750-21-02 ON AFT ACM INSTALLING THE NEW STYLE AIR BEARING ACM IN THE ACFT IAW CUSTOMER REQUEST. REPLACED COALESCE SOCK IAW MM 21-51-00. OPERATIONS CHECK & LEAK CHECKED GOOD.