What was found
DESCENDING THRU 8000. A BURNING ODOR IN CABIN. A LIGHT HAZE FILLED CABIN. FA COULD NOT FIND SOURCE. LASTED 3-5 MINS. AFTER PARKING, SMOKE BILLOWED OUT, BEHIND FLT DECK INSTRUMENTS. SEEMED TO ORIGINATE BEHIND DU1. RMOVED POWER FROM ACFT, & SMOKE DISSIPATED. TROUBLESHOOTING C/OUT FOR SMOKE. DURING SYS OPS, LT PACK FAIL MESSAGE OBSERVED, MESSAGE CODE 215C01, PERFORMED IAW AMM 21-51-13. RESISTANCE TORQUE CHK CONDUCTED ON LT ACM IAW AMM 21-52-09-700-801-A01, REVEALING ACM SEIZED CONDITION. LEFT ACM R & R IAW AMM BD700-A-J21-52-03-00AA-720A-A. AIR CON SYS AUTO & MANUAL MODES OPS TEST PERFORMED IAW AMM BD700-A-J21-52-00-01AAA-320A-A. NO FAULT NOTED. OPS CHKD GOOD. NO SMOKE IN CABIN.