What was found
D: L PACK AUTOFAIL CAUTION. LIGHT SMOKE APPEARED IN CABIN AND COCKPIT ON SHORT FINAL. L PACK AUTOFAIL CAUTION APPEARED AS WE CLEARED THE RUNWAY. SHUT OFF LEFT PACK. OUTPUT TEMPERATURE SAID 99?21-51-1HC WHEN SHUT OFF.C: MEL 21-51-1HCAT C DUE 6/27/24****VERIFIED LEFT PACK SIEZED*****L PACK AUTOFAIL CAUTION. LIGHT SMOKE APPEARED IN CABIN AND COCKPIT ON SHORT FINAL. L PACK AUTOFAIL CAUTION APPEARED AS WE CLEARED THE RUNWAY. SHUT OFF LEFT PACK. OUTPUT TEMPERATURE SAID 99°C WHEN SHUT OFF. (FLIGHT 3734 - FILED CLOSED) JUN 17, 2024 STATION: DTW--VERIFIED LEFT PACK IS SEIZED CAUSING LIGHT SMOKE IN CABIN TO APPEAR.DEFERRED L PACK PER MEL 21-51-1HAUTHORIZED BY MCCNO MX ACTION REQUIRED